Wine!
Wine always makes me happy, but it's even better when my friend from Spokane is visiting and brings lovely Washington State wines!
I've also found that after visiting all of the monument and memorials on school trips, I never go back...until I have guests. We went to Hillwood Museum today, home of Marjorie Merriweather Post (of Pavillion fame ). It's fabulous! If you're in DC and want to get away from the urban life, I highly recommend it.