Mount Tam is 784 meters (or 2571 feet) above sea level at its peak, with three major summits named the West, Middle and East Peaks. The West Peak is unofficially considered the highest point and the East Peak offers the best views of San Francisco. The West Peak was some 28 feet higher before it was flattened for construction of a radar dome in 1950.
Muir Woods has chargeable parking which must be booked in advance online or by phone for a specific 30 minute arrival window. You can park until closing and it is advisable to print or download your reservation beforehand as there is no wi-fi or cell phone coverage nearby.