The river walk cruise tour was very enjoyable. Really got to see a lot. The hop-on, hop-off worked pretty well and was informative, though we found it nicer to walk to some of the areas rather than wait for the bus. However, Viator needs to be better at explaining where you have to go to redeem the voucher. Our printout wasn't initially accepted at the cruise boarding area. We were directed to another place to redeem the voucher for actual boarding passes. We weren't the only ones confused, too. That's really the only negative. We would recommend the tour.
I really enjoy the San Antonio River walk Cruise and Hop-on-off Tour. It was a great value. The only thing that could have improved it would have been longer hours for the tour buses. The last buss leaves at 5:30 p.m.