If cross-country skiing is your passion, Glacier National Park is unsurpassed in its quality. The dry powder is exceptional here, and Telemark and cross-country skiers alike can get their freshies (first tracks after a big snow) throughout the park. The route most suited to a mellow Nordic trek is the Upper Lake MacDonald Trail, which follows Going-to-the-Sun Road for 8 miles. The Autumn Creek Trail near Marias is a more remote trail, but puts skiers in avalanche danger. Be sure to check snow conditions before heading out.