Disaster. First, be forewarned, Viator is a TRIP ADVISOR company, which she immediately put you on alert. I booked for two adults and two teens on Saturday March 25 for 10:00 AM Sunday March 26. Viator took my money, and issued a mobile ticket confirming the transaction. When we arrived on Sunday morning, we were told that the tickets were not honored due to the fact they were booked after 5:00 PM. There was no indication ANYWHERE on the Web site that the tickets were invalid or that there were time restrictions on date of purchased. We call Viator on Sunday, spoke to a call center rep, who then explicitly re-booked us for Tuesday March 28 10:00 AM over the phone with repeated verbal confirmation, which was the only available time in our busy scheduled. So Monday afternoon, March 27, we discovered on an email that the Viator agent booked us for Monday morning, which we never would have agreed to. So I called Viator (Remember, this is a Trip Advisor company, remember when the site was trustworthy?) got an outsourced call center rep who spoke English as a second language and who inflexibly followed a script and kept denying first the booking was with an agent over the phone and who kept denying that our ticket price would be refunded, despite Viators error. She insisted a manger would not be available (remember, this is clearly a call center!) to resolve this issue and we were faulted for the mix-up. This is not so much a criticism of the biking touring company but of Viator, and should remind all inquisitive tourists-to-be that Trip Advisor will direct you to THEIR companies in order to PROFIT from your travel plans and are probably collecting your INFORMATION to shape your searches or sell your identity to third parties. I spent 30 minutes with the VIATOR call rep, and finally just hung up (the poor rep is just trying to make a living, I know, so my ire was not taken out on her).