MARIN WATER DISTRICT
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Park Description: The Marin water sheds 21,000 acres are located roughly between Sir Frances Drake to the north, and Highway 1 to the south. Most of the park is oak woodlands with 130 miles of trails and seven reservoirs. While the topography is mostly hilly, it does contain three mountains over 1700'  including the 2500' Mt. Tamalpais.

Directions: The park is accessible from a number of points along Sir Francis Drake, Highway 1, and Ridgecrest Blvd going up to Mt. Tamalpais. Map link

Link: to park here.  
Trailmap: here
Cost: $7 or free depending on where you park.