If you want to dive, there are yachts with diving equipment, other must hire. That if you want to dive on the yacht while take party on board. But they have to be certified. If you can not arrive before the yacht marina, which go to dive, to do their training in the pool, and then the others arrive and we all get on the yacht. Once in the diving area has a boat and goes to people who did go diving practice in the pool, and away to make your diving. Then return the yacht to continue the party. This has to be before drinking too much alcohol. 

A yacht with diving permits for 400 USD leaves you in an hour, plus $ 180 USD per person to go diving. 

If you want a boat to pick them up on the boat and take you to dive and return, after class, comes in: $ 260 per person.