DoUpper Northwest
If you wish you had opted for a country vacation instead of a trip to D.C., it's not too hard to make believe in Rock Creek Park. The horse center offers trail rides, horseback riding lessons (group and private), and pony rides throughout the summer months. The trail rides are very popular, and reservations often are booked more than a month in advance. The pony rides and lessons also require reservations, but are much easier to get. For those visiting on a whim, and not interested in paying for a ride, you can just stop by and pet and feed the horses for free. If you traveled to the city on horseback, they offer full-service public stables for $600/month.
Tue-Fri noon-6PM, Sat Sun 9AM-5PM·Trail rides: $40/1 hour; pony rides: $20/10-15 minutes; lessons (1 hour): $50 group, $90 private
DoUpper Northwest
The 18 holes of golf in Rock Creek Park are a bit rough. That's not to say you can't have a good experience here, as it is quite a novelty to play golf deep in the woods, despite being in the city. The back 9 holes are challenging due to extreme hills and narrow fairways. Par 65. Golfers might want to consider the other two major courses in the city: Hains Point in Waterfront and Langston in Near Northeast.
dawn-dusk daily·$15-20/nine holes, $20-25/eighteen

Comet is another great pizza place in D.C. However, this is not your average restaurant. There are ping-pong tables in the back, clam pizzas, and concerts on Saturday nights. Diners, Drive-Ins and Dives Guy Fieri called it some of the best pizza he'd ever eaten. A local favorite! Try the wings! Also serves brunch on Saturdays and Sundays. Definitely kid-friendly.
Mon 5-9PM, Tue-Thu 5-9:30PM, Fri 5-10:30PM, Sat 11:30AM-10:30PM, 11:30AM-9PM·$6-20
This is quite possibly the city's favorite independent bookstore, with a non-exclusive focus on politics, a coffee shop downstairs, and frequent, excellent lectures. It is far off the beaten path, about a mile north of the Van Ness-UDC Metro Station, but it's a rewarding destination.
Mon-Sat 9AM-10PM, Sun 10AM-8PM