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LINCOLN, N.H. — This bustling mountain town, surrounded by White Mountain peaks and protected forests, makes the most of its outdoorsy location, and is perfect for couples who love to play together. That heart-thumping feeling you got when you first fell in love? That was your body releasing adrenaline and cortisol, the same hormones activated when you’re doing adventure activities. So, share the thrills — and the chills; the cold mountain air gives you more reason to snuggle.