There are a very large number of opportunities for outdoor recreation. Go to the Gallery map store or to the Boulder Bookstore and buy maps and a guide.Local favorites include the Anne U White hiking trail, the Chatauqua trails, White Rock, Eagle Trail, Boulder Creek, Dowdy Draw, Green Mountain, and Walker Ranch.
For Skiers/Snowboarders, the closest resort is Eldora, located near Nederland, CO. It takes about 45-60 minutes to drive there from Downtown. The 'N' RTD Bus to Nederland runs to Eldora during ski season.