- A Friend in Town
 - San Francisco - Offering guided tours of San Francisco, Napa and the Wine Country, Silicon Valley, and surrounding areas. - Above the Wine Country Balloons & Tours
- Sebastopol - Destination management service specialising in Northern California hot air ballooning. Also offers wine tours, executive transportation, and accommodation packages.
- Aim Adventures
- Oakley - Offering packages for hunting big game, upland gamebirds and waterfowl worldwide.
- Alcatraz Media San Francisco Tours
- San Francisco - Offers a broad selection of tours, bay cruises and sightseeing activities in the San Francisco area with online and phone booking.
- All San Francisco Tours
- San Francisco - Offers tours of the city, Golden Gate Bridge, Alcatraz Island, Chinatown, and more.
- Angel Island TramTours and Catered Events
- Pleasanton - Located in the middle of the San Francisco Bay.
- Appellation Tours
- Napa - Specialises in private wine tasting tours by limousine. Custom packages available for both Napa valley and the Sonoma wine country.
- Beau Wine Tours & Limousine Service
- Napa - Offers private, upscale wine tasting tours of the Napa Valley and Sonoma wine country.
- Behind the Scenes
- Napa - Full service destination and event management company. Services include Wine Country tours, art and shopping nights in San Francisco, cigar nights, etc.
- Black Panther Legacy Tours
- Oakland - Provides a historical bus tour of sites in Oakland, California which were significant to the Black Panther Party and the civil rights movement.
- Blue and Gold Fleet
- San Francisco - Commuting and tour ferries with ferry schedule, bay cruises, alcatraz tickets, private charters, map, and parking. Includes also information for Alcatraz day and evening tours.
- Budrick Vineyard Tours
- Sonoma - Offer daily viticuture tours in Sonoma and Napa Counties as well as gift vouchers, event planning, and wine seminars.
- California Rivers Paddlesports
- Windsor - Rent your own kayak or join us for a complete guided kayak tour to explore the rivers and ocean bays of Northern California Wine Country.
- California Wine Tours and Transportation
- Sonoma - Offers day tours in the Napa and Sonoma wine country. Luxury buses, limousines, vans, and sedans available for private charter.
- City Guides
- San Francisco - Free walking tours of the city.
- Country Spokes Bicycle Tours
- Walnut Creek - Offers bicycle tours in California with gourmet dining and luxury camping.
- Cyndi Recommends
- San Francisco - Offers travel consulting services and day tours for visitors to the San Francisco Bay Area.
- Day in Nature, A
- San Francisco - Offering small, custom, half- and all-day naturalist-led nature tours from San Francisco to Northern California national parks and wine country.
- Explorer's Club
- San Francisco - Tours for children and/or their families of San Francisco and the Bay Area. Day trips packed with fun and learning opportunities.
- Fire Engine Tours & Adventures
- San Francisco - Offers sightseeing tours, charters, parties, special events, and promotions.
- Footloose Forays
- Santa Rosa - Offering naturalist tours in Northern California and beyond.
- Getaway Adventures
- Wine Country - Biking, hiking, and kayak tours of the Napa Valley and the Big Island of Hawaii.
- Grape to Glass Wine Tours
- San Francisco - Private educational wine tours in Napa and Sonoma, including accommodations and transportation.
- Great Pacific Tour Co., The
- San Francisco - Offers sightseeing tours of the San Francisco Bay Area.
- Haute LaTOUR
- Napa - Specialising in small, private wine tours for two to six people in the Napa Valley.
- Here's Looking at Don Herron's Official Website
- San Francisco - Home on the Web for San Francisco's famous Dashiell Hammett Tour.
- HobNob Tours
- San Francisco - Offers San Francisco historical walking tours of Nob Hill and the financial district.
- HUMMERtrader.com
- Burlingame - Features classified listings of Hummers, accessories, and gear.
- Lodging and Llamas
- Fort Bragg - Three-bedroom holiday rental just south of Fort Bragg, plus three different llama treks.
- Lost Coast Trail Rides
- Fort Bragg - Leads horseback riding trips in Mendocino County featuring the ocean and forest trails of the Lost Coast.
- Mr. Toad's Tours
- San Francisco - Hop on one of Mr. Toad's pre-1930s vehicles for a once in a lifetime tour into the heart of San Francisco, California.
- Napa Valley Tours & Trail Hikes
- Napa
- Nubian Cruises
- San Francisco - Offering cruises to Egypt, Turkey, Greece, Morocco and the East Mediterranean and North Africa.
- On The Level SF
- San Francisco - Offers guided and self-guided walks exploring the city by foot.
- Outback Adventures
- San Jose - Guide service and rental shop specialising in kayaking, backpacking, and climbing in California.
- PVA Travel Planning
- Palo Alto - Operates educational tours in the form of luxury and expedition cruises, private rail trips, and more. Some destinations include Arabia, India, Bhutan, and Germany.
- Quality Tours
- Pacifica - Private customised & off the beaten path tours of San Francisco and the surrounding area.
- Red and White Fleet
- San Francisco - Ferry, cruise and tour operator on the SF Bay.
- Ricochet Ridge Ranch Horse Riding Vacations
- Fort Bragg - Unique riding holidays on the beach and redwood forest: accommodation at Bed & Breakfast inns, hot tubs, entertainment, English or Western instruction.
- San Francisco Ghost Hunt
- San Francisco - Walk to some of San Francisco's most notorious haunted places and meet the enchanting ghosts that call them home. Departing year-round.
- San Francisco Shuttle Tours
- San Francisco - Comprehensive tours of San Francisco's most popular attractions. Features more tour stops, free ferry cruises and refreshments, and a separate tour guide from the driver.
- San Francisco Tour Guide
- San Francisco - Provides tour guide service in English, Japanese, and Indonesian/Malay. I am a 14-year resident and am a travel guide writer and journalist.
- San Francisco Tours
- San Francisco - Online tour reservations for San Francisco, Muir Woods, Alcatraz, Wine Country, Monterey/Carmel and Yosemite National Park.
- Serendipity Land Yachts
- Santa Clara - Bus charters serving San Francisco, the Monterey Peninsula, and Silicon Valley.
- Serku Adventure Treks
- Oakland - Provides trekking, rafting, and safari's exclusively in Nepal, the Himalayas, Chitwan, and on rivers, specialising in small groups of six to ten people.
- SF Activities 4 Less
- San Francisco - Offers a Deluxe City Tour of San Francisco and daily tours to Alcatraz, Wine Country, Carmel and Monterey, Yosemite, and Muir woods, and also provides hotel reservations.
- Sonoma Cattle Company and Napa Valley Trail Rides
- Glen Ellen - Professionally guided horseback riding adventures for novice and expert riders.
- Soussan's Wine Tours
- Santa Rosa - Offers tours with reserve tastings, personal wine shopping, and education classes.
- Spring Training Tours
- Livermore - Offers baseball travel packages.
- Super Sightseeing Tours
- San Francisco - Offers a wide range of tours in the San Francisco Bay Area.
- Tours of Napa
- Napa - Wine tour service to Napa Valley and Sonoma County.
- Vampire Tour of San Francisco, The
- San Francisco - Explore the gothic side of Nob Hill and learn how vampires have contributed to the shaping of San Francisco as we know it today.
- Victorian Home Walk
- San Francisco - Offering small walking tours of San Francisco's Victorians, taking people "off the beaten path" where tour buses and mini vans are prohibited.
- Wine Country Jeep Tours
- Windsor - Winery tours in Sonoma and Napa. Also offering redwood, off-road, and coastal tours.
- Wine Country Reservations
- Wine Country - Features Napa Valley travel planing, hotel reservations, activities, and wine tasting appointments.
- Wine Destinations
- Napa - Offering private wine tours and interactive culinary demonstrations.
- Wine Tutor, The
- Saint Helena - John Thoreen guides two-day open, private, or custom excursions through Napa Valley.
- Wok Wiz
- San Francisco - Culinary and historical walking tours of San Francisco's Chinatown, North Beach, and Asia.
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