I own a dark-sky (well, darker sky) California observing site in the hills northeast of Pinnacles National Monument, southeast of Hollister. It is forty fenced acres of grassland at the 3000 foot level (tops) of the Diablo Range, three miles west of Panoche Pass. This is the site called "Willow Springs 3000" at the TAC list of observing sites.
Before I bought this site I looked at, and observed from, many hilltop locations south of San Jose. You can read about that at my page about looking for a site.
My site is dark for a location within two hours of San Jose. The ClearDarkSky map shows the location to be "in the blue", but it isn't really that dark. (The CDS light pollution data is not current.) The horizons are visibly light-polluted in most directions: Hollister and Salinas to the north and west and the Central Valley towns from Merced to Fresno in the east. It is dark enough for a fine view of the Milky Way and the zodiacal light is prominent in good conditions. Normal zenith SQM readings at the site vary from 21.3 to 21.55. (It can be darker if fog and low cloud block the light pollution from Salinas.) The gegenschein can be seen when it is in a favorable location.
The site is good for visual observing because there are no nearby light sources visible -- no porch-lights, no car lights. The southern horizon is low and dark for reaching targets like omega Centauri and the Vela SNR.
The site is primitive with no "modern conveniences". I have two shipping containers for storage and a picnic table; there is no power or plumbing. There are minor amenities, like a generator and tools and soap and water and chairs and a car-camp potty, in one of the containers. The site offers little shade; I have a large tent-without-walls type shade roof that can be set up over/near the picnic table.
The last 2 1/2 miles of road is uphill dirt but it is drivable by an ordinary vehicle as long as it is dry.
You can look at the site (and see the containers) via GoogleEarth at 36 40 24.7 N 121 01 29.3 W.
Most of this GoogleEarth image is my forty acres of grasslands: the north, east, and south borders are visible because the property is fenced. (The west border is barely visible at GoogleEarth and difficult to see here; at the southwest the fencing follows the road and does not include the property's southwest corner.)
I use the flat area at the containers and the ridge above the containers for observing, the latter can be windy. There is room for about five cars-worth of observers at each spot.
The small dark non-tree NE of the containers is a "tank" or pond, formed by a dam in the gully. It is fed by a small surface-water spring. It usually fills in the spring and retains some water all year. It would be nice to have an animal habitat there, but the main inhabitants are frogs.
I currently observe from the site several nights per month, usually at new moon. I have several telescopes at the site, including a "bent" six-inch refractor RFT and a bent eight-inch refractor RFT (with a flip-mirror to a four-inch) that I have been using with nebula filters for the past few years.
The site is fenced and unfortunately I have found it necessary to lock the gate. If you would like to observe from the site, contact me via the information at the homepage