Just as the perk indicates, Viator offers users a chance to book their trip, without the stress of paying right away. With this option comes more flexibility. If paying for a rental car, hotel, or anything else during your vacation, you won't have to worry about paying for the tours right away. Additionally, your card won't be charged until two days prior to the event. The reservation applies to most all trips and excursions you'll find on site. So book your trip today, without any of the stress.