No, we didn't just pick it because it has romance right in the name. (Although it doesn't hurt.) Valentine is a prime location to check out the state's sandhills, and it's also got the Niobrara River in the mix. Take on the Civilian Conservation Corps Nature Trail, which ends at an old fire tower. At the top is an observation deck with great views of the prairie. If plains aren't your scene, trek over to Smith Falls State Park to see the highest waterfall in Nebraska. As for lodging, you have plenty of resorts, B&Bs, lodges, and even elk ranches to choose from.
A couple's trip to Nevada necessitates a redirect from the Strip and the, uh, stripping, to the state's other wonders at Lake Tahoe. It's huge, surrounded by trees and snowbanks, looks damn fine during a sunset, and considered by some (OK, USA Today) to be the best lake in America. The snowboarding and skiing is pretty famous at this point, but the place has just about every outdoor activity imaginable. Since it's a resort town, there are also plenty of nice hotels, restaurants, and boutiques. And this is still Nevada, so there are places to play blackjack, if you're so inclined.