There's lots of competition vying for your business so discount tickets are always available for bus and boat tours, bicycle rentals, museum admissions, etc. Here are some links for you to explore when planning your DC vacation.
- GO City Card: for a flat fee, you choose from a list that includes the Spy Museum, Hop-on/Hop-off bus tours, Newseum, Mount Vernon, etc. This link above is the "official" web site but the cards through Groupon or Living Social at about a 50% discount. That's a fantastic deal.
- There are lots of different website that offer a variety of deals for tours, museums, shows, etc. Definitely worth checking out but don't buy until the last minute in case your plans (or the weather) change. Here are links to some website offering discounts of sightseeing and local attractions: