Reminds me of a few more things I like to bring....
mesh hammocks and green bags for fruits and veggies. A Sharpie for writing our name on our RED Solo Cups <img src="http://www.traveltalkonline.com/forums/images/graemlins/toast.gif" alt="" />, Glow sticks, thin plastic decorative tablecloths (makes the party festive and you can clean up real easy!) plastic ties for hanging burgees, cold brew tea bags. (Just shove one or two in a gallon of water in the morning, and you have a gallon of iced tea in 3 minutes. They don't have the cold brew down there.