Viator is probably the worst travel/tour company I've ever encountered. If you can do everything yourself and do not have to call you are winning. However if you have to call you will encounter the worst the world has to offer. First no one speaks English or completely understands it so if they get tired of trying they will hang up on you. Secondly there is absolutely no customer service. I was trying to book several tours for several people on my trip and they screwed it up so bad it was ridiculous. It took 4 phone calls to get 2 trips booked for 3 people because of the unprofessional and unskilled workers they employ. And because they do not have customer service there are no over sights. Don't bother!