Typically peak bloom in the suburbs is a bit later than in the District, so it might be worth seeing how the Capital Crescent Trail is looking. The Arboretum is also a good less crowded viewing spot but I think it is past peak there. But it's still worth a visit to see the Capitol columns and I think the azaleas should be coming in now.
The tourists were very bad this weekend, by the way. I had theatre tickets so had to deal with the unwashed masses. Is it that bloody hard for people to let folks off the metro before trying to board? I have bruises from fighting my way off the orange line at Metro Center.