Hi, I created a ID just to answer this question because I REALLY loved Coki Beach. It is a small local beach, the water is much clearer than other beaches is why it is popular with snorkelers. It was $10 last January and that included equipment and dog bisquits to feed the fish. We had such a blast.
No, they do not have para sailing or dolphins or much tourist stuff, which to me is why it is a wonderfull place to go and meet real locals and sit and chat with them. It costs $10 or $11 each person by taxi to get there, it was further than Megan's where most of the tourists go, a bigger beach but the water is not as clear. Megan's beach also charges a fee to go in.