Pay attention - Really good experience but filled up with scams. First advise, get there early (before 9 am) otherwise there are too much tourists. Second one, walk your way to the beach without listening anybody. They will try to block you and ask you to pay and other stuff. The only things you need to pay are the access to the beach (little station next to the diving store), they will give you a bracelet in exchange that you will need to show (I paid 80 pesos). And then you will need a guide (don’t bother you taking a whole tour, it’s more than 100$). The guide is only 20$ and give you the équipements required to snorkel (life jacket, mask…). Don’t pay them at the diving store, they are freaking expensive. Concerning the swimming, there are 2 zones, the first one is free and the second one required either a guide or a tour. Obviously, turtles are in the second zone… You can’t go swim with the turtles by yourself (strictly forbidden). Guides are very friendly and will swim with you during more than 20 minutes (30 minutes for us as we were the only tourists). Plus, if you don’t see any turtles, they give your money back, a good point. Concerning my experience, I saw 3 turtles and one ray, which was a memory that I will never forget.