While reenacting your favorite scenes from Balto is romantic in its own way, a couples retreat in AK isn't complete without some Northern Lights action. Your best bet is to head to Fairbanks. Make sure to book a place with aurora wake-up calls (many of them do this) and then decide whether you want to embark on a lights-themed van tour or dogsled adventure for the day. Keep in mind that the latter will fulfill those Balto fantasies.
You're going to Sedona to marvel at all the majestic red rocks, but it's your call whether you do this via pink Jeep tour or hot-air balloon. (But trust us: unless your date has Barbie Dream Car fantasies, there's really only one option here.) When you decide you need a break from staring at nature, head to one of the city's 20 art galleries to take in the fine Southwestern paintings and ceramics. Then head back outside to hike, kayak, ride ATVs, or maybe just drink wine in the fresh AZ air.
The very phrase "Victorian mountain village" should sell you on this AR escape, but in case you need more convincing, here it goes: Eureka Springs has outdoorsy activities (canoes, scooter tours, big cat refuges, etc.). Eureka Springs has small-town charm (chocolate shops, kaleidoscope-kite stores, dinner trolleys, etc.). But most importantly, it has mountain opera, which everyone knows is the best kind.
Napa Valley is the expected choice here, but you can mix it up by pretending to be Batman and enjoying your California wines in a legit cave. While there are many excellent, echo-y options out there, most of them are reserved for private parties (read: crazy expensive to book). But at Jarvis Estate, it's part of the tour! After you've finished your subterranean wining, there's plenty of excellent food, shopping, and river sports in Napa to fill the rest of your vacation. Also, lots more wine.
You're probably thinking this should be a ski resort town, but why limit yourself to the slopes? At Estes Park, active couples can go whitewater rafting, fishing, horseback riding, hiking, climbing, zip-lining, and ropes-coursing all in one weekend. Once they finally wear themselves out, there are spas or booze centers (wineries, breweries, and distilleries!) where they can unwind. Or just recharge before hitting salsa night at Kelli's Lounge, which seems like the only thing to do after enjoying a booze center.