What can I do at my sleepover?

My mom won't take us anywhere. Let's get that out of the way. I have lots of board games and internet access. It rains all the time, so nothing outside. I have a pool, but I'm apple-shaped and kind of embarassed cause my friend is hourglass shaped. We're about 13, so nothing too kid-ish. Any ideas? My mom says she'd be happy to do stuff with us if it's possible.