City Sightseeing San Antonio Hop-On Hop-Off City Tour. Experience the best of San Antonio on a City Sightseeing hop-on hop-off sightseeing tour. Board an open-top, double-decker bus at any of the 12 stops around the city and enjoy recorded commentary about San Antonio's history, culture, architecture and arts. Visit San Fernando Cathedral, see HemisFair Park’s Tower of the Americas, explore the Alamo and spend time shopping and browsing galleries at the Rivercenter Mall along the River Walk. Choose a 24- or 48-hour ticket, giving you flexibility to sightsee at your own pace. Book Now and Save 20% Off City Sightseeing San Antonio Hop-On Hop-Off City Tour.