Get out of your comfort zone. I assume you're a nerd, so take dance lessons, or get into boating (community boating on the charles), get beyond your comfort zone. You'll meet new people, expand your horizons and change your perspective on things.
Another tip is to meet your neighbors. As soon as you move in, walk around and knock on a couple of doors. It's always nice to know the people you live near and the best time to meet them is right after you move in.