I came across two really great pages on Facebook (gotta love social networking...lol). One is DC 365 and the other is called Things to Do in DC Before you Die.
They both cover really cool things to do in and around the city--I believe 365 has fan pages for other cities as well.
I used both pages as sort of the jumping off point for a class video project. The goal of the project was a create a short video promo for an organization. I wrote a bucket list of sorts for DC of things that everyone should try to do in the city, whether visiting or whether you live here--
so here is a short version of "100 Things to Do in DC" (soundtrack is Welcome to DC by Mambo Sauce)