Dani, looks like you have thought of plenty of good stuff for your next bday! Running through the sprinlers, a fire in the firepit and making somemores, jars for firefly catching if you have them where you are...

One of my daughter's favorite parties was when she wanted to have a baloon fight, and the kids ended up digging a huge hole, filling it up with water and playing in the mud! Some of the mom's weren't so thrilled, but at 18 they still talk about it. (And even tho we are in California, :-) she doesn't roll around in the mud with her friends in the backyard anymore.)