Cute anniversary idea?

Me and my boyfriend's 2 year anniversary is on September 4th. I've travelled a lot this summer so I haven't had a job since June so I don't have a ton of money (by that I mean I barely have $100 total in my bank account). he's leaving for the marines this October so I really wanted to make it special. I live in the Boston area, if that helps and if anyone knows anything fun to do around here. we're really up for any idea at all, but definitely not just staying home and watching a movie.