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you could wear a murkin
Other then that I would just prepare ahead of time, like char is saying. Put together some games or activities, maybe play a few songs on the harmonica or best yet, come up with some really scary or sexual scary ghost story's and work on your delivery so when you tell them around the campfire you scare the shit out of people.
Another good move I have used is to just head into a chicks tent at night who as been giving you the eye, do it all non-chalet. She will it the hint and appreciate your confidence.
I'm not sure about how well the tent visit would go... but if you are gunna do it anyways make sure noone else see's you doing it, and if she has a tentmate that they're out busy doing something else. And like detox said prepare some stuff, nothings worse than going into a girls tent, saying a awkward "hi" and leaving...