give some more info and you might get more resonses
price range? age range? hobbies? activities? pool?
I suggest renting a golf cart because they are part of the experience of San Pedro, fun to drive around exploring or running errands or just fun!
Boats are different. You can't just rent a boat and go as you can in the Virgin Islands. You must hire a captain or go on a tour. We used to get a captain & his boat for the week, and we would let him know where we wanted to go fishing, snorkelling, Caye caulker, shelling or Bar-b-q, etc!!!
Prices depend on what you do, how long you do it and who you do it with!
Belize it!