Venture into the winter river valley in Letchworth State Park on a mostly off-trail adventurous hike with an expert naturalist guide. Meet at the Perry Entrance Gate at 10:00 am on Thursday, February 21, 2008. Bring water and lunch and dress for the weather. If snow is more than 6 inches deep, snowshoes may be useful. Will car pool. 4 1/2 hours, 3 1/2 miles.