We purchased the 48-hour Hop-on / Hop-off Trolley Tour and Riverwalk Cruise tickets before our trip to San Antonio to see our son graduate from Basic Military Training. We may have been able to find the tickets cheaper if we had purchased them on site, but having the confirmation in hand when I left home gave me peace of mind. I couldn't believe how easy it was to find parking near the area where you pick up the tickets. Access to the Trolley and Cruise was quick and easy. Everything was clean and right on schedule. Our tour guides were fabulous!!! There are variations in personality and experience, of course, but we had funny, engaging guides for the cruise and the trolley. SHOUT OUT TO JP ON THE TROLLEY. He went out of his way to chat with us and give us recommendations for meals and directions to sites we may like. He deserves five stars! My only warning about this tour is the access to margaritas the size of your head :) But, you have someone to drive you, so maybe this is the time to go for it. Oh, and definitely stop at the Iron Cactus on the Riverwalk. It is admittedly a bit pricey, but OMG! Without a doubt, one of the top 3 meals I have had in a restaurant EVER!