It's a summer camp job. They're not looking for academic exploits.
Write about things like how many mountains you've climbed, or if you've done running races, or if you have an arts and crafts skill you can teach. If you can play the guitar or sing, that's good to mention, too.
Everyone else applying is probably leaning heavily on their academics but the bottom line is, even if this is a purely educational camp, it's for the summer so that means bored kids who are going to want to get outside.
Once outside, what do they do?
That's when this great skill or talent comes into play.