You will never want for things to do in Washington. There are 17 buildings to the Smithsonian Museum system, easily another 15 major monuments and numerous private museums & galleries. Had enough of Museums- try Rock Creek Park, with miles of hiking or biking trails, horseback riding, tennis or golf. Stroll the canals of Georgetown, or take a boat cruise down the Potomac. You might just go home more exhausted than when you arrived!