Back Country Excursions founder Cliff Krolick set up his mountain-biking base camp in 1991 with the aim of guiding adventurists on low-environmental-impact tours along the 26-mile network of trails spread across the White Mountains' foothills. The trails, accessible with one-day or annual passes, traverse terrain suitable for both novice and advanced riders, from a gently rolling double track to harrowing technical descents peppered with slaloms and tree spring noose traps set by territorial squirrels. Cliff and his crew of savvy cyclists guide multi-day biking tours through the wilderness and set up camp for overnight trips in their mountain lodge or screened-in backcountry yurt. To ensure that the environment stays pristine for future generations, Cliff donates a portion of annual profits to a variety of local environmental causes.