If you're going to be in D.C., my friends and I really enjoyed our meal at CENTRAL MICHEL RICHARD. 2008 James Beard award for Best New Restaurant 2008. It was packed on a Friday night and definitely on the loud side, but the food was really good. I would go back just for Michel's chocolate bar dessert! I also loved the tuna burger with oven roasted tomato and thick potato tuiles which added a nice crunch/texture factor. The fries that came with my burger were nicely salted, too! All the appetizers and entrees the four of us ordered were executed very well.
I LOVED KOMI! Three of us shared one bottle of white (~$50) and one bottle of red (~$60) with dinner so with tax and tip, it was $210 per person. This is the most money I've spent on myself for dinner, but the food and the company made it more than worth it

If I lived in D.C., I would want to eat here for special occasions. For weekend dinner service, there is a set menu. The 14+ courses were so delicious and leaned towards Mediterranean flavors. Their pita bread that came with the pig entree (succulent meat and crispy skin!) was unlike any pita bread I've ever tasted before. I want some now.
If you have a sweet tooth, go to Baked & Wired Bakery in Georgetown! This place is awesome! I went twice in one weekend. Their cupcakes are better than any of the cupcakes I've had in Chicago. They're big, moist, dense (in the best of ways), and fantastic! Better than Swirlz, Molly's, Sugar Bliss, Sweet Mandy B's, etc. The vanilla latte was my favorite! The brownies are thick, rich, moist, and amazing as well! The chocolate Nutella with roasted hazelnuts! Do we have any great bakeries with brownies here in Chicago?!
Brunch at Tabard Inn was great. This place was packed, and service can be slow but the servers are very friendly. Start with their doughnuts with whipped sweet cream. You can't go wrong with their sweet or savory entrees. Vanilla French toast with pineapple strawberry compote. Almond waffles with blueberries. Eggs benedict with confit pork belly hash. Poached eggs with sauteed spinach over English muffins and home fries. Everything was great! Well-made breakfast dishes.
If you have a car, Ray's Hell Burgers is worth a trip. 10 oz premium aged beef, fresh, loosely hand packed, grilled, with choice of toppings. I got mine with pepper jack, cognac mushrooms, charred jalapenos, and grilled onions. The burger with a large order of fries (This place has good fries.) was less than $12. I really liked this burger! Way better than Kuma's Corner. Mmm mmm mmm
The Gibson is a great place for drinks. Speakeasy style with nice cocktails. Another place for drinks that was really nice was the rooftop lounge at The W/The Washington Hotel. You can see The White House and the monuments from here. So pretty!