Hawk Hill is located in the Marin Headlands which is part of the Golden Gate Recreational Area. You can hike to the hill or simply drive up to it, park, and then make a very short and easy hike up to perhaps the best viewing vista of SF. This is not so much a hiking peak, but more of a viewing peak. It is something that should not be missed in the SF area. Because of its popularity and ease of access, there are many sites with information and comments about it. I learned of it from a SF native who told me to take a bottle of wine up to it and enjoy the sunset. It was good advice.
Hawk Hill is also noted as a spot for viewing raptors and butterflies.
Hawk Hill can be very windy, and foggy, so it is wise to be prepared for such weather.
Driving access is by Conzelman Rd., Golden Gate Recreational Area, Sausalito, CA 94965, so you can get driving directions by using mapping software to this point. There is parking just before the road turns into a one-way road going to Point Lomita lighthouse.
Here are the driving directions from SF: take US-101 across the Golden Gate Bridge and, once across the bridge, quickly take exit 442 for Alexander Ave. Keep left at the fork and follow signs for US-101 S/San Francisco. Turn left onto Alexander Ave and then take the first right onto Conzelman Rd. which starts to proceed up the hills in Marin Headlands. At the traffic circle in a little over a mile, take the third exit and stay on Conzelman Rd.