What are some really fun things that I could do on my birthday?

Something out of the ordinary. Not the old, party movie and dinner with friends, but me and my best friend are skipping school for a day to go into the city and we want to do something that we'll remember for a long time that is a little different. We're both girls, and we're both 17 if that helps. We were thinking Experience Music Project since we live in Seattle, and maybe like tape a bunch of pictures of the kama sutra all over one building. Something scandalous, without being illegal. :D doesn't have to be scandalous, just fun. :D thank you!