Our only regret: that we hadn't been there on one of the days when they offer bike rides starting at Velo Vino, with rentals available from the nearby Calistoga Bike Shop.
Instead, we went on to Napa Valley Bike Tours in Yountville, where we'd arranged to rent road bikes for a self-guided tour of Napa and Sonoma valleys. While we chose to go it alone, the company also offers a variety of tours and packages as well as private group tours.
The next day brought one final stop on our mini-bike-extravaganza: Point Reyes Outdoors in Point Reyes Station, where we rented mountain bikes and took to the trails around the Point Reyes National Seashore.
If You Go ...
STREETS OF SAN FRANCISCO BIKE TOURS: 385 Linden St., San Francisco; http://www.sosfbiketours.com or 415-448-7673. Tour prices range from $65 to $115 depending on distance. The Food Tour, $95. Custom options available.
VELO VINO NAPA VALLEY: 709 Main St., St. Helena; http://velovinonapavalley.com or 707-968-0625.
NAPA VALLEY BIKE TOURS: 6795 Washington St., Yountville; http://www.napavalleybiketours.com or 707-251-8687. Full-day bike rental options include hybrids for $39, road bikes for $65, mountain bikes for $50, tandems for $78, electric assist bikes for $55, kids' bikes for $25. A variety of tours, vacation packages and custom packages available including Classic Napa Valley Bike Tour (with stops at three or four wineries), $139 per person, tasting fees not included.
POINT REYES OUTDOORS: 11401 State Route 1, Point Reyes; http://www.pointreyesoutdoors.com or 415-663-8192. Mountain bike rentals, $42 a day.