I Need Help 4 My 13th B-Day Party

I am having a 13th birthday party in about 2 weeks. I am havin it at a hotal and i have no clue wat games we should play. There is a swimming pool and we r gonna go swimmin but i dont no what 2 do 4 the rest of the nite. There is gonna b about 10 girls there. (no guys)all around the ages 12-13. I need games desperetly.
~?Courtney?~