This is my experience with them…my family and I just returned from a Mediterranean Cruise and booked a tour with Viator for a private French Riviera tour from Port Villefranche. The morning of the tour I was first in line at 5:30am to get tickets for the tender. I wanted to ensure we were on the first tender because it departed at 7:30am and our tour was scheduled to start at 9am. At 6:30am, we were informed that due to the weather, it would be unsafe to launch the tenders so we would not be able to leave the ship. I managed to contact someone from Viator at 8am through the chat function of their web site and explained the situation. They informed me that since the tour was not cancelled before the 24hr period, that it would be up to the local operator. I was just notified that they will not be issuing a refund. You can decide for yourself if that is reasonable or not. I’m just providing you with the facts.