City sightseeing san francisco city wine hop on hop off downtown tour half day wine enjoy a fully guided 90 minute tour of san franciscos most famous sites with unlimited hop on and off privileges for 24 hours stops all over central san francisco including chinatown fisher manswharf and union square the only half day wine tour in san francisco you will travel through marin county and into the world famous carneros wine region in the town of sonoma included on the sonoma wine to