8th grade graduation party ideas..?

I just graduated middle school and I'm having a party at my house. Its going to be family, family friends, and my friends. I have a small house and yard so I need some things to do to entertain some 14 year olds for a couple hours. If possible, some ideas for outside and inside. I was thinking of getting a slip and slide, water guns, and waterbaloons for outside. For inside I'm hoping that my grandpa and uncle will let us have the tv to play wii games. But I need some more ideas for things to do inside that don't require a tv, but aren't lame, incase it rains and we can't go outside. Thanks for anything!