Action Challenge
Organizers of hiking, biking, riding and rafting expeditions around the world. Works with charities, companies, and private groups. Based in London, England.
www.actionchallenge.com Details

Active Tours
Walking and cycling tours in Europe and California. Offices in Santa Cruz, California and Switzerland.
www.andiamoadventours.com Details

ActiveTrips
Runs hiking and biking trips in the western United States, including Hawaii, Central America, and Asia. Includes area information and photos.
www.activetrips.com Details

Adventure Club of New Jersey
Specializes in sailing in the Caribbean, South Pacific, and Mediterranean; skiing in Colorado, Canada, and western United States; plus local hiking, biking, and inline skating.
www.usac.com Details

Adventure Planet
Plans biking and hiking trips to Moab, Utah; Baja, Mexico; Alaska; and worldwide to Nepal, Thailand, India, and Peru.
www.adventureplanet.com Details

Adventure Treks
Offers trekking, snow-shoeing, and multi-activity trips in Chamonix, the Alps, Tunisia, and Peru. Based in Chamonix, France.
www.adventure-treks.com Details

Alaska Bush Safari Company
Customized private adventure tours of Alaska. Catering to small groups and families. Air tours, back country expeditions, wildlife safaris, National Park and glacier tours.
www.alaskabushsafari.com Details

Alpine Interface
Guided trekking and hiking tours to the Alps, the Himalayas, southwestern United States, and Mexico plus snow shoeing and ice climbing in the winter. Includes trek, accommodation, and company information. Based in Connecticut.
www.alpineinterface.com Details

Backroads Active Travel
Bicycling, hiking, walking, cross-country skiing and multisport vacations in Europe and the United States.
www.backroads.com Details