Waterville Valley is a self-contained resort village in New Hampshire's White Mountains, reached by Route 49 and then mostly explored on foot, skis, or bike. It does not have much urban texture, but it has a clear reason to exist: mountains close in on three sides, the Mad River runs through the valley, and trailheads start almost at the edge of town.
In winter, Waterville Valley Resort is the anchor. In summer and fall, the better day is usually outdoors: climb Mount Tecumseh, walk toward Greeley Ponds, or use the village as an easy base for bikes, paddling, and trail loops.
The strict verdict is that Waterville Valley is worth a page because the appeal is not just accommodation or a strip of shops. A traveler already in the White Mountains with a spare day can make a real mountain day here without needing a long drive.