Here is a partial list of things to take:
socks / shoes
sweater or sweatshirt (check weather)
2 bath towels
1 beach towel
1 jacket or raincoat (check weather)
1 pair sweat pants/long pants (check weather)
hat or sun visor
personal hygiene items
LET US REPEAT - flashlight!
batteries for flashlight
Did we mention flashlight?
Food, snacks, drinks, cooler, plates, cups, cutlery : everything you would take on a picnic
plastic bag for wet clothes
blanket(s) or sleeping bag(s)
think of bringing a flashlight
Lantern/lights (flashlight would be good too)
camping stove, pots/pans
Fan (if electric site)
oh yes... a flashlight and extra batteries... just in case we forgot to mention it.