We accidentally booked the wrong whale watching trip. We wanted to go with my son and his family. When I tried to cancel this excursion, I discovered that it was 100% NON-REFUNDABLE. Of course, I should have realized this before I booked it, but it was a shock. 100%? Because of this, I will never use Viator again nor will I recommend it. Too bad, because their prices are good. But completely non- refundable, even with one week's notice, is not acceptable.