This is one of those smaller Natl Parks - friendly, uncrowded, and well maintained. I was just out there and the orchards are in fall color. It is best noted for its splendid Victorian mansion where Muir lived. It's in Martinez near the Carquinez Strait, and should not be confused with either Muir Woods in Marin County or John Muir Wilderness in the high Sierra. You can't escape freeway noise around the mansion itself, but if you hike uphill either direction you can. The urban section is connected to much larger open space sections, including the John Muir Land Trust. By the time all these various patches are put together, as they nearly are, it should amount to over 10,000 acres. If you combine that with protected water district holdings, Regional Park properties, and what is set aside for the Carquinez Loop Trail, the land amount is more than double that. A bit too unhealthily smokey today to want to hike around much; but the smaller park inside town itself is a nice little jewel for locals. A couple of non-tripod photographers also showed up about the time I left.