Do an online search using keywords such as "gay-friendly Washington D.C." or "Washington D.C. gay travel."
Expland your search to cities such as Arlington and Alexandria in Virginia and Bethesda and Rockville in Maryland.
Check out some Washington D.C. travel sites as well as some sites about gay travel (see Resources below).
Visit personal Web sites and blogs of Washington D.C. residents. Ask them to recommend gay-friendly clubs, bars, restaurants and neighborhoods.
Ask your hotel concierge for suggestions about gay-friendly activities.