Mt. Diablo, the tallest mountain of the Diablo range, towers over the county. From the top on a clear day you can see the Sierra Nevada mountains to the east, and Mts. Shasta and Lassen to the north. Entrances to the park are from Walnut Creek and Danville.
The 'mothball fleet', a group of ships mostly from the World War II era, sits just east of Martinez. The ships are being stored rather than dismantled. Among the ships there is the Glomar Explorer, built by Howard Hughes for the US Government to scavenge a sunken Soviet Submarine. The fleet is visible from vista points along Interstate 680 on the north side of the Martinez/Benicia bridge actually Solano County.
The Ruth Bancroft Garden is a world renown low-water botanical garden in Walnut Creek. The four acre garden has hundreds of succulents and other low-water using plants. It is known particularly for its aloes. It is open by appointment only.
Amtrak
One of a number of train stations connecting California cities and connecting to Amtrak's California Zephyr and Coast Starlight