I am actually still 17 (one more month till 18! I cant wait!)
The first thing I will be doing is going down to a gas station and getting a lottery ticket. It is sorta a tradition between me and a bunch of my friends ^_^ several of them turned 18 a couple of months ago, and there are still several who are younger than me, but we all go and do it on the birthday ^_^
Cant say I ever have, or will, drink, have sex, smoke... things like that, I am just not into, and none of my friends are either so it all works out fine ^_^
I might actually go buy a gun though... I have been wanting a nice 12-guage for a long time ^_^