An adventurous 32-mile almost-exclusively-off-road ride in Livermore, some not-even-on-the-map paths, mostly paved, some dirt, including Del Valle Park (cut down in scope due to insufficient tires for steep loose gravel and underestimating of how gnarly some side trails would be), and a stop for wine tasting.
Beautiful remote-feeling nature only 10 miles from a BART station.