Hi,
How far are you willing to travel? Fair Lakes is quite a ways from D.C.
Knowing that my info is a few years out-of-date . . .
In Fairfax, near the intersection of Fairfax Blvd and Chain Bridge Road, there are a few nice casual spots. Bombay Bistro is a casual, but not hole-in-the-wall Indian restaurant. I think I only went once, but it was pretty good. Anita's is VERY casual New Mexican food. Even if you don't go out for dinner there, it's pretty close to Fair Lakes and a good option for lunch.
A bit farther away is Tysons Corner. Tons of shops, tons of chains, and probably a handful of decent restaurants. Cafe Deluxe may fit your bill. It's not unlike the Cheesecake Factory, but it's a local chain and they do a good job. Same with Chef Geoff's Tysons. I don't know if Googlemaps is up-to-date, but there's also a Legal Seafoods and a Palm. A Woo Lae Oak, too, if you'd like to do Korean. It's a pretty densely populated area, so I'm sure there are plenty of other options if you do some research. If you're looking for options without driving into D.C., I'd try the Tysons Corner area.
Ronna