Help!!! Ideas please!!! I'm thinking sleepover... (gurls only)

I'm also having a girl's 10th birthday sleepover. A couple of things I may include that the kids have enjoyed in the past are:
1. Silly String. Everyone gets a can of silly string and goes wild in the yard (weather permitting). It's really messy for the lawn but comes out of hair & off clothes easily. I get the silly string at a dollar store or WalMart.
2. The kids just love a treasure hunt. If you're still doing goody bags (Our goodie bags are a small bag of chips, chocolate bar, and a pop) - make a treasure hunt for the goodie bags. If you have alot of kids, split them up and color-code the hints so that each team knows their hints (ours are on green paper, theirs are on yellow). The goody bags are at the end of the trail - some great places for them are the washer or dryer, in the piano stool, or in the fridge.

Have fun!