21st Birthday party ideas - looking for something a little different?

I'm turning 21 in the middle of July this year. I want to do something a little different and already we've changed the venue 3 times. I was going to have something formal, at a restaurant but now we're going for an outdoors venue, about middle of the day. We're thinking botanical gardens or a... show more I'm turning 21 in the middle of July this year. I want to do something a little different and already we've changed the venue 3 times. I was going to have something formal, at a restaurant but now we're going for an outdoors venue, about middle of the day.
We're thinking botanical gardens or a rainforest (I'm in Sydney, Australia).The problem is, I'm not sure what kind of games or whatever we can do at the party. Any one have any ideas or suggestions?
Also, since its outside, do you think it would be a good idea to have a theme or not?
Update: Just reading some of your answers i thought i should add, I dont drink anymore, neither do the majority of my friends, and since its going to be a day thing (again just for something different) I dont think they will drink either.
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