The floating pontoons will have some options for you. There is usually a glass bottomed boat or sub for people who don't swim ans still get to see some coral reef. There is also a higher platform which gives some height for viewing, A slide, snorkling, scuba, pool noodles, life vests, etc. Or just a dip next to the pontoon. Lunch is usually served on the boat so you can come and go as you wish.