If you are on your San Francisco tour and You like to enjoy biking then I would like to suggest some place that will remain best to enjoy this activity. I am sharing here the name list.
Twin Peaks
Golden Gate Park Loop
Presidio Promenade Trail
Crissy Field and the Palace of Fine Arts
The Embarcadero to Fisherman's Wharf
Across the Golden Gate Bridge to Sausalito
Bay Area Ridge Trail: The Golden Gate Bridge to Marin Headlands
These are the best road biking trails in San Francisco. So don't miss to have a great experience with biking there. What do you say about my suggestion?

My father is excited to enjoy cheap getaways from san francisco.

I am very happy to read your post because, at the time, I was collecting information about San Francisco. Next month my all family decided to go to explore there. We will go there to explore these places. Palace of Fine Arts is a very attractive name for me. so you share some information. I hope you reply to me soon.