You want to take plenty of clothes,bathing suit, a couple of pairs of shoes. In the evening, make a campfire. Then later, after the fire burns down, get about 3 potatoes and 3 onions. Quarter them. Put butter in them and some salt and pepper on top of them. Wrap them in aluminum foil. Then put them in the hot coals for 5 minutes. Then take them out. When you unwrap them, put them on some plates. Put some more butter on them, if you want to, and eat them. As a prank for your sister, get a rubber snake, and put it by or inside her sleeping bag.