I have a niece who just turned 9 and I'm looking for fun things to do with her this summer. My sister and I are going to set up a camp site in the backyard, and I'm thinking of setting up a treasure hunt, complete with maps and clues! My niece is full of energy though, so that will only occupy her for so long, and I'll need other things lined up.

So, let's talk games, crafts, and activities!
What were your favorite things to do when you were 8-10 years old?
What kinds of things do you do with the kids in your life?