O'Leary Tours - Creates tours and guides clients through Ireland. Packages include castles, race tracks, and golf courses.
O.A.R.S. Rafting and Adventure Travel - Features unique rafting, sea kayaking, and multi-sport vacations on rivers and coastlines throughout the world.
Oak Tank Outfitters - Grand Canyon river rafting and hiking. Visit and enjoy the Hualapai Indian Reservation.
Oasis Divers - Caribbean beauty and small island charm. Includes diver packages and Grand Turk information.
Oasis Overland - Organizes and leads overland trips in Africa and the Middle East.
OasisAfrica - Offering wildlife and photography safaris in South Africa, Botswana, Namibia, and Zimbabwe.
Ocarina Expeditions - Offers hiking, mountainbiking, tree climbing, spelunking, and wildlife viewing.
Ocean Adventures - Offering scuba diving tours and instruction in the Dutch Caribbean.
Ocean Frontiers - Offers places upon a ship circumnavigating the globe, via Terra Del Fuego, Cape Horn, Hobart, and Marlborough Sounds.
Ocean Outfitters - Offers whale watching, bear watching, and hot springs tours. Also specializing in Cougar Annie's Garden tours.
Ocean River Sea Kayaking - Offers guided sea kayaking tours, rentals, and walking in Abel Tasman National Park.
Ocean Sailing Expeditions - Offers sailing adventures in the Indian and Pacific oceans on board the Belagaer.
OceanBLUE Yacht Charter Agents - Yacht charter agents based in the U.K. specializing in bareboat and skippered sailing charters in Greece, Turkey, and Croatia.
Ochils Tours - Provides mini coach and bus day tours around Scotland. Includes trips to the Scottish Highlands, Fife, Crieff, Glencoe, and Loch Tay.
Ocoee Rafting, Inc. - Adventure company offering guided whitewater rafting trips on the Ocoee River.
Odyssey EcoTours - Leads tours to Antigua, Chichicastenango, Pacaya volcano, and more.
Odyssey Expeditions - Lists worldwide travel programs for teens featuring academic, art, sport, and special need categories.
Odyssey Overland - Travel company offering overland expeditions from London to Australia for adventure holidays, gap years, or career breaks.
Odysseys Unlimited - Offers worldwide tours for small groups of seniors.
Off the Beaten Path - Specializes in active, small group, cultural, specialty, and walking tours to the Loire Valley, Dordogne, Provence, Burgundy, Bordeaux, the French Riviera, and Paris, France.
Off The Map Tours - Offers travel information and adventure holidays in Mongolia, including biking, motorcycling, trekking, and cultural tours.
Off-Road Experience - Features an off-road school, driver training, excursions, and more.
Offbeat Safaris - Riding and Landrover safaris with luxury mobile tented camps in remote areas of Kenya.
OFlo Catamaran Charters - Offers a modern 40 foot catamaran sailing yacht available for surfing charters and holidays in the Caribbean and other destinations.
Oiva Holidays - Tour operator based in Delhi, offering adventure, cultural, mountaineering, and wildlife tours across India as well as Sri Lanka, Bhutan, and Nepal. Provides hotel bookings and various tour packages.
Okavango Delta Safaris - Tour operator offering safaris of the Okavango delta and river.
Okavango Horse Safaris - Offers 5-10 day itineraries in the Okavango Delta, Botswana, for up to 8 guests at a time.
Okavango Tours and Safaris - Specialist travel company providing tailor made beach holidays to the heart of Southern Africa.
Okeechobee Outfitters - Assembles national and international hunts, also provides foreign language guides.
Old Colony and Newport Scenic Railway - Historic tourist railroad operating a scenic train ride on 12 miles of track along Narragansett Bay in Newport RI.
Old Mexico Guided - Offers guided hunting tours of Mexico with duck, quail, dove, and deer leases.
Old Quebec Tours - Offers minibus and full bus tours of Quebec City, Montmorency Falls, and rural Quebec, and land-sea tours for whale-watching and harbor cruises.
Old Salt Charters - Agents representing sailing and power boats in Vancouver and worldwide.
Old Village Duck Club - Blinds located between Claypool Reservoir and Greasy Slough.
Old West Dude Ranch Vacations - Arizona, Colorado, Idaho, Montana, New Mexico, Oregon, Wyoming, British Columbia Dude/Guest ranches.
Olde Ipswich Tours - Offering custom tours of New England and Europe, including wine and chateaux France tours, history, and nature. Spanish and French available.
Olivier Tours - Specializes in the Republic of South Africa, Namibia, Botswana, Malawi, Zimbabwe, and Zambia.
Olly Reston - Mongolia is renowned for its nomadic culture, pastoral lifestyle, warm hospitality, and magnificent countryside. It also has a rich and colourful cultural ancestry.
Olympia-Reisen Namibia - Tour operator offering fly-in, cross-country, and tailor-made tours.
Olympic Air - Providing helicopter and aircraft rental, charter, and maintenance.
Olympic Raft and Kayak - Rafting and kayaking trips in Olympic National Park, Dungeness Bay, Lakes Aldwell and Crescent, and Freshwater Bay.
Omega Express Bus Rental Service - Charter bus and tour services in the Northeast U.S. Omega Express is family owned and operated and serves the New York, New Jersey, Connecticut, and Pennsylvania areas.
Omineca Wilderness Adventures - Offers fully guided fishing, wildlife photography, and outdoor tours with Frank and Herb. Upscale wilderness lodge in North Central British Columbia.
On Course Travel Ltd - Specializes in horseracing, motoring, and short break holidays in Ireland.
On Safari - Comprehensive source of information on African Safaris. In essence, everything one needs to know when traveling to East or Southern Africa.
On the Loose Expeditions - Offers guided outdoor adventure travel including Vermont hiking weekends, trekking in Nepal, backpacking, backcountry skiing expeditions, mountaineering, women's trips, yurt camping, and kayaking.
