This is a long 32 mile ride, but well worth the effort to ride the 4 mile rolling hills that make up Ridgecrest Blvd, aka The 7 Sisters. The ride starts with 6 flat miles of side roads and bike paths before you climb a mile and plunge 2 miles into Mill Valley. This is a good warm up before you begin an 8 mile 2000 ft assent, but you will be rewarded at the top flying along the 7 Sisters. The road back to Fairfax is a knotted rough paved road that starts with a 2.5 miles of steep descent with quick turns down to the Alpine Lake Dam. Once across the dam you begin the last 4 mile climb of 1100 feet. The next mile of descent is steep and twisty, but once past the golf course the last 2 miles is steep, but the turns are much softer. My hands got tired squeezing the breaks to control my speed. The last mile to the start is mostly flat.