We were in AC last April and did our first ever night snorkel with Tulu (if you do a search on his name you can find out how to find him) - We hope to book a full day and a night snorkel again with him when we return in April. I thought I would be a little scared, but it was awesome, and with Tulu you a very safe. We saw some super cool eel, trunk fish, octopus, and a reef shark, but from a distance, and more that I can't even remember. Definately put it on your list !!!! We brought waterproof lights that we gave to him when we were done, and have bought several more for the return trip, you can find them at most stores like Target, K-mart. I thought such a small light wouldn't be too good, but they worked perfect for us. I don't think you want too much light or you will frighten the night creatures into hiding anyway. Have fun !!