16th B-day Party Ideas?

I was born in America, but grew up in Ireland. Everyone thinks that seeing as I'm kind of a yank and turning 16 is huge over there I should do something biggish for my 16th in March. It is 6 months away, I'm just not sure what to do. Having sleepovers, going to town for the day, going to the cinema, or going to discos are always done for everyone's birthday every year.

I'd love to do something different, something new. There would be 10 people including me (all girls). I would really appreciate any ideas, because I really can't think of anything! And if possible, the less it costs the better.

By Bláthnaid F.