Some of the indoor waterpark resort’s new cabins feature theater rooms and treehouses. And the that’s not all that’s new at the resort.

For those who want to immerse themselves in nature without sacrificing modern comforts, Wander Austin Falling Leaves is a dream escape.

Snow-covered forests, crackling fireplaces and mineral-rich spas make upstate New York an ideal setting for winter retreats. As the temperatures drop, the region’s most discerning hotels offer a ...