Their viator booking systems sucks the big one.... beware if you are booking an event (especially shuttle service to the airport in Maui). The system allows you to book hotel pick-ups to the airport that apparently causes booking errors. They cannot (or wont) change/rebook or refund groupon. Of course the customer service sucks and didnt go any distance help just gave me shine. BUYER BEWARE and price was same as vendor price on website so no extra value.