We almost cancelled twice. Once because my child wasn't feeling well, and another time when no one showed up to meet us at the the meeting point. I called and the Viator number and the guide Tadeo said to cross the border. So we made the trek. Tadeo was very accommodating and knowledgeable! He took several pictures of us and bought us a delicious taco lunch. We went thru souvenir shops and food markets, but this was a lot of walking for my child and it was hot! So we asked Tadeo if we could head back early. It was a nice tour but it was just bad timing for us.