Just a caution against blindly trusting Viator tours for you or your family. Although the tours themselves are probably all well done by the companies/individuals that provide them, Viator can be very deceptive in the listing of the tours. We booked a tour on their website that was listed as a tour for Yellowstone Park, only to discover that the tour was 5hrs outside of Yellowstone itself. When I contacted them this was the response. First they checked it while talking to me on the phone and said quote "You are correct sir, it is listed as a Yellowstone Park Tour". Their next move was to remove the tour from their page. That was good for future customers, but also an admission of guilt that they had not done ANY research before listing, but whatever. Then received an email saying, sorry but tour is non refundable your reservation is still in place. So even though they obviously falsely represented the tour, they were unwilling to give even a credit.
Be aware of these practices by VIATOR and research thoroughly before booking, or use one of several other companies to book your vacation plans.