Mountain biking on Mount Tamalpais

The Marin Hills are a series of steep high ridges and peaks in southern Marin County. They are a part of the long Pacific Coast Ranges mountain system. The centerpoint of these hills is the 2,571 foot (784 m) Mount Tamalpais near Mill Valley. The hills are bordered to the north by the Santa Rosa Plain and Laguna de Santa Rosa; to the east by San Pablo Bay, the northern arm of San Francisco Bay; to the south by Golden Gate Strait; and to the west by the San Andreas Fault, running through Tomales Bay, Olema Valley, Bolinas Lagoon, and Stinson Beach. Parts of the hills are protected for their scenic beauty by Mount Tamalpais State Park and the Golden Gate National Recreation Area. The many ridges and peaks of these hills form a dramatic backdrop to the Golden Gate Bridge, the San Francisco skyline, and several towns around Richardson Bay when viewed from the south.

Mount Tamalpais State Park is a California state park, located in Marin County, California. The primary feature of the park is the 2,571 feet (784 m) Mount Tamalpais. The park contains mostly redwood and oak forests. The mountain itself covers around 25,000 acres (100 km2). There are about 60 miles (97 km) of hiking trails, which are connected to a larger, 200 miles (320 km) network of trails in neighboring public lands. The park received 564,000 visitors in as of 2003. Muir Woods National Monument is surrounded by the state park. From the peak of the mountain, visitors can see up to 25 miles (40 km), in a view that encompasses San Francisco, most of the North and East Bay, and the Farallon Islands. Occasionally, the Sierra Nevada are visible, 125 miles (201 km) away.

The KFRC Fantasy Fair and Magic Mountain Music Festival was an event held June 10 and 11, 1967, at the 4,000-seat Sidney B. Cushing Memorial Amphitheatre high on the south face of Mount Tamalpais in Marin County, California. Although 20,000 tickets were reported to have been sold for the event, as many as 40,000 people may have actually attended the two-day concert, which was the first of a series of San Francisco–area cultural events known as the Summer of Love. The Fantasy Fair was influenced by the popular Renaissance Pleasure Faire and became a prototype for large scale multi-act outdoor rock music events now known as rock festivals.

The Mountain Play Association is a 501(c)3 organization responsible for the production of theatrical events at the Sidney B. Cushing Amphitheater on Mount Tamalpais in Marin County, California. The stone amphitheater, named for the owner of the railroad company which constructed the Mount Tamalpais Scenic Railway, is at an elevation of 2,000 feet and has 4,000 seats. The organization was founded in 1913, and is a member of Theatre Bay Area and the North Bay Theatre Group. John C. Catlin became the first president of the Mountain Play Association. He financed the first play in the Cushing Memorial Amphitheatre in 1913.The Mountain Play presents one musical a year, in May and June. In 2014, they presented South Pacific, from May 18 through June 15. Past productions have included Hairspray, Fiddler on the Roof, and Hair. The mission statement of the Mountain Play Association reads, "The Mountain Play Association’s mission is to produce an annual, spectacular, outdoor theatrical experience that nurtures an appreciation of Mt. Tamalpais, involves and strengthens the community, and builds on decades of tradition."

The Newport Pop Festival, held in Costa Mesa, California, on August 3–4, 1968, was the first music concert ever to have more than 100,000 paid attendees. Its sequel, billed as Newport 69, was held in Northridge, California, on June 20–22, 1969, and had a total attendance estimated at 200,000.

The Sidney B. Cushing Memorial Amphitheatre, also known as the Cushing Memorial Amphitheatre or simply the Mountain Theatre, is a 4,000-seat open-air venue in Mount Tamalpais State Park, in Marin County, California, United States.

Mount Tamalpais (; TAM-əl-PY-iss; Miwok: Támal Pájiṣ), known locally as Mount Tam, is a peak in Marin County, California, United States, often considered symbolic of Marin County. Much of Mount Tamalpais is protected within public lands such as Mount Tamalpais State Park, the Marin Municipal Water District watershed, and National Park Service land, such as Muir Woods.

Lake Lagunitas is a reservoir on Lagunitas Creek in Marin County, California.

Bolinas Ridge is a north-south ridge in southwestern Marin County, California. Much of the western side of the ridge is protected parkland in the Golden Gate National Recreation Area, and the eastern side is watershed lands of the Marin Municipal Water District.

Bon Tempe Lake is a reservoir in Marin County, California, managed by the Marin Municipal Water District. It is the widest lake in the Mount Tamalpais watershed, and on Lagunitas Creek. Beneath its dam is Alpine Lake. Lake Lagunitas is immediately to its east. Built in 1948, with the construction of the earthen Bon Tempe Dam, the lake's name is an Americanization of the Bautunpi family name. The Bautunpi brothers ran a ranch and dairy that was removed with the creation of Bon Tempe and Alpine reservoirs.Fishing and hiking are activities around the lake. Rainbow trout and both largemouth and smallmouth bass are caught in the lake. The California Office of Environmental Health Hazard Assessment released a warning regarding eating fish caught from this lake based on the elevated mercury level.

Larkspur Creek is a short stream which flows 3.5 miles east to meet Corte Madera Creek in Larkspur, California just before reaching Richardson's Bay. The creek was named for the town of Larkspur, which was named by Georgiana Wright, a Briton and spouse of the 1887 developer of the area. She named the town of Larkspur for lupine flowers on the hills that she mistook for larkspur.

Muir Woods National Monument is a United States National Monument managed by the National Park Service, named after naturalist John Muir. It is located on Mount Tamalpais near the Pacific coast, in southwestern Marin County, California. It is part of the Golden Gate National Recreation Area, and is 12 miles (19 km) north of San Francisco. It protects 554 acres (224 ha), of which 240 acres (97 ha) are old growth coast redwood (Sequoia sempervirens) forests, one of a few such stands remaining in the San Francisco Bay Area.