Yeah, and bring your own mosquito repellent (they charge like $10 for a little can of it), and a bandana to cover your mouth up with. And sunglasses. Joel's right about the shoes, but also wear clothes that you don't care about, either. I learned that the hard way.

No one told us anything... Make sure you do wear pants, though. Shorts will be a horrible idea, unless you wanna get cut and muddy. And closed toed shoes. I wore flip flops, and had to rent THEIR boots...I don't even wanna think about if they were sanitized or not...:/ But the four wheeling thing was awesome!!
The beach part only sucked because the wind was too crazy for us to get into the water. They wouldn't allow us. And also, the "beach" isn't like a normal one. You can't just walk down the shore and run into the water every now and then. There are big rocks separating you from the beach. You could probably climb over them...they're not high rocks, but they are slick. I'd save the money and just go with the 4X4 thing. It was nice riding in a group, too...