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I know many people think bowling is lame, but usually while they're doing it, they're having a great time. Some bowling alleys offer night bowling parties where it's dark and everything glows. They'd have a seperate room for pizza and pop, etc. My daughter had one last year and everyone had so much fun that she's thinking she'd like it there again this year.

If you do a sleep over could do themed movie night. My birthday is on Feb 13 and when I turned 13 (granted was many years ago) I had friends over and we watched Friday the 13th movies all night long. If it's around Valentine's Day could rent sappy "chick" flicks for you all to watch, etc.