Turning 20 on Monday! ideas for me and my girlfriends?

I havent begun planning anything until now, and im celebrating a week later. Im thinking about maybe a road trip to New York City with friends. What kind of things would be fun to do there? we may not go to nyc so any other ideas would be greattt=) Im a horrible planner!|||take them to the mall or shop wherever,and everyone get a pedicure and paint your toenails in a funky colors...it's fun..You can all meet at a spa and have your hair,nails,toes,done.also if not too many rent a limo so you can all ride together...dress fancy and go out to eat,when you get out of the limo,,everyone have big sunglasses on,as if you are someone really important. Have the restaurant serve your b-day cake there.