Bohlman - On Orbit - Bohlman.
Bohlman Road is a street in Old Town Saratoga, one block off of Main Street. The road goes up a ways then basically dead ends.
So the ride starts at 6th Street and Bohlman in Saratoga. You go up to the intersection of Bohlman Road and On Orbit. Take a left onto On Orbit. Take this until it dumps you back onto Bohlman Road. Hang a left on Bohlman and continue riding up to the top where there is a sign that says END. This is where you turn around and ride down.
Repeat. Note: Both streets are a bit steep, that is why it is a challenge.