This isn't the fake Disneyland submarine ride on tracks. This is the real thing. It can be very expensive during high tourist season, but you can usually find coupons for discounts in the tourist magazines found in Waikiki. Tours take off every hour all day 7 days a week. You will probably see turtles, lots of tropical fish, maybe a shark, eel, octopus, dolphins, and during the winter- Whales. This is a great experience for all ages as you can talk about what you are seeing. No babies are allowed though. I was worried about getting scared & feeling trapped, but it was just like riding a really cool bus for about 30 minutes but we went down over 100' deep. Really a neat experience.