How can I entertain my little cousins while camping in the backyard?

Alright, my little cousins, who are 5 and 7, are coming over in two days and we're going to have a sleepover where we set up a tent and sleep in the backyard. It's illegal to have fire pits in my neighborhood, so instead we are using a chiminea ( a mini outdoor, portable fireplace ) to sit around and cook marshmallows and stuff. Most of the campfire stories I know are scary, and most the activities I know involve more than two or three people. What sort of things should I do with my little cousins to keep them entertained and make it a sleepover they won't forget? I am not really looking for sites that can give me ideas since I have already looked through most of them. Now I want opinions from people on what to do. It can be food, songs, games, whatever, everything is appreciated. Thank you!