It is to be visited, soon and often and with the kids, because Washington really does offer something for all ages. But before you go, prepare. Washington has more than you and yours will be able to see and do in one trip. Planning is essential. Leave the car, bring a map.
Timing is everything.
There is no off-season in Washington, but some times are busier than others. In summer, things slack off, but there is a price to be paid. You can still have a fine time, but your hotel must, repeat must, have a pool. Food and hotels are pricey here, but not the sights. The dark side.