Billy Goat Hill is a small park at the west dead-end of 30th St. in upper Noe Valley. It’s just below Walter Haas Park.
Top entrance is off Beacon, a block or so from the top of the Harry stairway (239 streps). It has 81 steps and a zigzag dirt trail.
Starting from the top end of Diamond down from Diamond Heights Blvd. with a right on Beacon: 1 thru 5
There’s a new park sign since my last visit. Top to bottom: 6 thru 35