14th B-Day Party

My 14th B-Day Party is in August, and I want to have an UNFORGETTABLE time! I recently got a in-ground pool dug in my backyard so i wanna have a pool party. (it will be co-ed if that helps) I waz thinking like OC or Laguna Beach cuz im way obsessed, but I can`t really think of any specific ideas. The party will probably be around 4 or something and i`m not sure when the [3 or 4 or 5] guys will have to leave...there will be around 12 girls [maybe] and i will invite maybe 7 or 8 to spend the night...
I need some outdoor co-ed games to play and a fun game for just the girls at night.
ANY IDEAS????????