pretty much the park west of pulaski from 14th street following pennsylvania all the way to the capital and then back down independence on the south side of the mall (smithsonian museums surround) with welfare banks and spots like air and space etc, you'll find a ton of shit. anything more "east coast" in terms of neighborhoods is a little more tricky, but time is better spent in the federal area. parking really isn't that crazy in DC so long as you're not in a no rush hour zone. enforcement comes in waves so best to get the scoop from a local or a shop.