Most of the times when I write these virtual presentations, I tell people what they should bring. In this case it is very simple. All you need are a couple of T-shirts, a towel, some bermudas, sandals and a swim suit. Oh, I almost forgot, you will also need sunglasses, a cap and mosquito repellent.
Although it does not get too hot here, If you are going to reserve a room, look for a room with air conditioned.