We took a shuttle to 7 mile beach it was very affordable and the shuttle just ran up and down the road all day, like a public transport bus. Don't get off at the first exit tho if you wait a mile or two the beach is almost deserted it was awesome we then tracked down a cabana that sold us some snorkeling gear and even set us up with parasailing for a really really good price. It is one of my favorite ports of all time, great memories. I'm actually going back too in November. I'll let you know if I do anything else fun!!