Electric scooters under Oahu water are unreal. You cruise past Diamond Head and Koko Crater on a catamaran, then submerge with a self-propelled electric underwater scooter in Maunalua Bay.

I love the safety-first setup: you get clear instructions, and a guide stays close while you ride. I also love that it works well for non-swimmers, because the scooter does the hard part for you.

One possible drawback: your hands-on scooter time can feel shorter than you expect if you’re hoping to steer for long stretches on your own. The guides are actively helping you spot marine life, so you’ll spend some time being led.

Key points to know before you go

• Electric scooter control, even if you can’t swim: you’re guided and supported the whole time
• Diamond Head catamaran views while you’re waiting and relaxing on the water
• Guides in the water with you to help with safety and finding turtles and fish
• Snorkel time when you’re not on the scooter plus snacks and non-alcoholic drinks
• Family-friendly limits (minimum age 10, minimum height 4 feet) and a hard weight cap

Submarine Scooter Basics: How You Actually Ride It

This is an Oahu outing built around one simple idea: you get to explore underwater life without needing to be a swimmer, scuba diver, or expert snorkeler. You’ll submerge and ride a self-propelled electric scooter through the water while your guide manages safety and direction.

You do not just get tossed in and hoped for the best. There’s a safety briefing first, then hands-on instruction on how to operate the scooter. The whole point is confidence. One diver named Fin stood out in earlier trips for being patient with first-timers, which is exactly the vibe you want when you’re learning something new while your world turns upside down.

There’s also a reality check worth saying out loud: underwater time isn’t infinite, and you may not control the scooter for the entire window. You’ll still be riding, but guides may adjust pace and position so you can maximize turtle and fish sightings.

Catamaran Cruise to Diamond Head Views

Before you ever go underwater, you’re on a 50-foot (12-meter) catamaran heading along the south/east Oahu coast. The ride includes big view moments: Koko Crater, Maunalua Bay, Diamond Head, and the Koolau mountain range.

This boat portion matters more than it sounds. If the ocean is choppy or the wind picks up, you’ll appreciate having that sheltered break on the water deck between activities. And even if you only care about the scooter, the coastal sightseeing is a nice “warm-up” while you’re waiting for your group’s underwater turn.

The tour runs for about 2 hours total. That includes cruising, briefing, your scooter session, and then whatever snorkel or relaxing time fits after your turn. The boat leaves promptly, so plan to arrive early and not gamble with parking or traffic.

Your Underwater Session: Turtles, Coral, and a Guide Nearby

When it’s time to go under, you follow the guide through the area with schools of tropical fish, living coral reef, and the main target: green sea turtles. The scooter is the workhorse here. You’re not powered by arms or struggling to kick—you’re gliding while someone keeps an eye on conditions and group flow.

You’ll be surrounded by marine life in a way that feels different from surface snorkeling. Even when you’re not seeing a turtle at every second, the amount of fish activity can be intense. Earlier groups highlight fish everywhere, and that “right next to you” feeling is part of why people keep calling this the best thing they did in Oahu.

Also, you’re not truly alone underwater. A diver is with you throughout the ride, along with staff support for safety and spotting. That extra set of eyes can make a big difference if you’re nervous or if you’re trying to follow cues while adjusting to the gear and pressure changes.

One more note: on some outings, you may see fish come closer when fish-feeding happens as part of the experience. You might even notice fish gathering around the scooter area. If that’s a big part of your fantasy of the day, this is worth it.

Switching Between Scooter and Snorkel (Plus Snacks)

Your turn is only part of the total experience, and that’s where the rhythm of the day helps. When you’re not on the scooter, you can snorkel around and explore more of the area around the boat. You’ll get snorkel gear and fins for that section, so you’re not left improvising.

This portion is also a time-saver if you want more water time but don’t want the pressure of being on the scooter the whole time. Snorkeling from the boat is an easy way to keep your day moving and still focus on seeing fish.

Between activities, snacks and drinks are provided on board. Based on prior experiences, it’s often simple snack fare (like chips and water), but it’s exactly what you want after time in wetsuit gear and salt air. There’s also a dry storage setup on the boat, which helps with phones and belongings you don’t want to soak.

And yes, there’s usually photo and video support. Some guides and staff take photos/video during the adventure, and those files are offered for purchase afterward. If you’re the type who wants proof beyond your memory, this is a big plus.

What to Wear and Bring (So Your Day Stays Comfortable)

This is one of those tours where what you wear matters. You must wear a swimsuit, and you should bring a towel and sunscreen. The wetsuit top and snorkel gear are provided, but you’ll still want to rinse, dry off, and protect your skin after being in the sun and wind.

Comfort hacks that show up again and again:

• Bring a towel you don’t mind getting salty.
• Pack sunscreen and reapply if you’re outside on deck for long stretches.
• If you’re prone to motion sickness, take something before boarding. One review specifically recommends Dramamine ahead of time for smoother sailing.

Also consider bringing a small change of clothing if you tend to get cold after water time. Even with a wetsuit top, wind can chill you on the catamaran deck, especially if the day is breezy.

If you’re worried about pressure changes in your sinuses, you’re not alone. The tour staff does a lot to keep people calm and comfortable, but you should still take care of yourself before you arrive.

Safety, Limits, and Who Should Plan on This

Let’s talk safety in plain terms. You get a safety briefing, instructions on operating the scooter, and staff attention throughout. The scooter is designed to take the physical work out of the equation, which is why it’s so popular with people who aren’t strong swimmers.

Still, there are participation limits you need to check carefully:

• Minimum age: 10 years old
• Minimum height: 4 feet (1.2 meters)
• Maximum weight: 350 lbs
• Maximum height: 6’8″
• A waiver is required, and participants must have no previous medical conditions listed by the provider
• Minors must be accompanied by a paying adult

In other words: it’s beginner-friendly, but it’s not a free-for-all. This is an ocean activity with real constraints.

If you’re a confident swimmer and want a technical ocean challenge, you may find this more guided and “controlled” than you expected. One common disappointment is not getting as much time as you’d like driving the scooter yourself. If you’re the type who wants full control for long stretches, keep that in mind.

Who this tour fits best:

• First-time underwater explorers
• Non-swimmers who want an underwater experience without the same risks
• Turtle and fish lovers who care more about wildlife than training
• Families with kids old enough to meet the minimum height/age and follow instructions

Price and Value: What $188.49 Gets You

At $188.49 per person for about 2 hours, you’re paying for more than a standard boat ride. You’re paying for a guided catamaran cruise plus a guided underwater scooter experience with gear, wetsuit top, and snorkel equipment included, along with snacks and non-alcoholic drinks.

Value comes from the combination:

• You get two kinds of water time (scooter + snorkeling) rather than just one
• You get safety support with staff close by, which is a real cost driver
• You get provided gear, so you don’t have to buy or rent basics separately

The only “value friction” to watch is the time ratio. If you’re expecting a long, solo scooter session where you’re always steering and never waiting, a shorter hands-on window can feel pricey. But if you’re happy to let guides position you for sightings—and you want to feel safe—this price starts making sense fast.

Also, you’re not just paying for the scooter. Diamond Head-area cruising is part of the day, and it’s a solid bonus.

Should You Book This Oahu Submarine Scooter Adventure?

Book it if you want a high-impact wildlife experience without needing swim training. This is a strong fit for turtle sightings, colorful fish, and a guided format that keeps you comfortable—especially if you’re nervous about open-water swimming.

Skip it or look for an alternative if any of these are true:

• You mainly want maximum hands-on scooter control for a long time
• You don’t like guided pacing and prefer solo exploration
• You’re very sensitive to motion or pressure issues and haven’t planned for that

One last practical tip: arrive with your basics done. Sunscreen on early. Swimsuit ready. Towel packed. If the ocean or weather forces a change, staff typically offer another date or a full refund, so you’re not stuck, but you’ll still want to be ready for the day you book.

If you want one memorable, out-of-the-box Oahu water experience, this is one of the easiest bets to make.

FAQ

How long is the Submarine Scooter Adventure?

It runs about 2 hours, including cruising, instructions, your underwater scooter time, and return.

Do I need to know how to swim?

No. The scooter is designed so you can participate even if you cannot swim. You’ll still follow staff instructions for safe operation.

Where does the tour start?

Meet at Bob’s Hawaii Adventure, 7192 Kalanianaʻole Hwy suite e111, Honolulu, HI 96825. The activity ends back at the meeting point.

What time should I check in?

Check in is 30 minutes before departure, and the boat leaves promptly. You must bring a photo ID for check-in.

What’s included in the ticket price?

The tour includes the submarine scooter adventure, snacks, non-alcoholic beverages, and all necessary equipment, including a wetsuit top and snorkel gear.

What should I wear or bring?

Wear a swimsuit. Bring a towel and sunscreen.

Who can participate (age, height, weight limits)?

Minimum age is 10, minimum height is 4 feet (1.2 meters), and the maximum weight is 350 lbs. The maximum height is 6’8″. A waiver is required.

What if weather is bad or the tour is canceled?

The experience requires good weather. If it’s canceled due to poor weather, you’ll be offered a different date or a full refund. If the minimum number of travelers isn’t met, you’ll also be offered an alternative or a full refund. You can cancel up to 3 days in advance for a full refund.