Ideas for 19th birthday?

I'm turning 19 in 3 months. I haven't done anything to celebrate my past birthdays since my disastrous 2 past birthdays, and simply because I didn't care. Turning 19 actually means something to me so what can I do with some friends? I don't want to have dinner at a restaurant, it's already been done so much by my other friends. I don't like partying, casinos, or alcohol so please don't suggest anything that involves these things. I'm a homebody, and I like humorous, adventurous, or relaxed activites. And I'd prefer something relatively cheap. Thanks in advance. :)