It's a boat, where you actually sit underneath in a large glass seating area. We did it as part of the sea and see tour. It was great once they got to an area with fish. It's like looking out an aquarium, you see some local fish, sea turtles, barracuda, and starfish. We didn't bring our 5 and 3 year old, since it was more than just this part of the tour, but we think they would've enjoyed the boat ride!