Aspen Center for Environment Studies

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Lonely Planet review

The Aspen Center for Environmental Studies (ACES) is a 22ac (10ha) wildlife sanctuary that hugs the Roaring Fork River. With a mission to advance 'the ethic that the earth must be respected and nurtured,' the Center's naturalists provide summertime guided walks, eagle demonstrations, special programs for youngsters and more.

In the winter, snowshoe and ski tours are available in various locations, and its weekly scheduled slide shows may give you some respite from the frigid outdoors. You can take a self-guided tour of the preserve (with snowshoes in winter, if you prefer) surrounding Hallam Lake. The native indoor trout stream may be of interest to anglers and others.