12th B-Day Beach Party - Need Ideas

In 2 weeks im turning 12 and I have always wanted to do a beach themed b-day party.After finally getting my mom to say yes to taking us to florida and stay at our condo there, I have a problem. I think people are going to be bored by just staying on the beach all day. I was wondering if anyone had some ideas as of what we could do to make it a more entertaning party.
Please Help Me!