Booking tours online through Viator can enable you to plan some of your vacation activities ahead so you have less to think about once you get to your destination.
While in some cases you may save money and time booking through Viator, note that it is smart to do some research prior to booking a tour with so-called prepaid vouchers. If you do use prepaid vouchers, DO NOT forget them, as they are needed by the local travel vendors to get paid by the booking company, and they won’t take you on the tour without them. (See my review on Planning Activities.)
Viator (http://www.viator.com/) offer a variety of tours, but when you check out the local travel vendor’s website online you may see that the Viator’s prices are sometimes a bit higher than if you book with the local vendor.
Before booking with a company like this, I would advise you do some searches on IGoUGo.com, TripAdvisor.com, and other related sites to find recommended tours, and try to book directly with the vendor rather than using a third party company. You may be able to more easily negotiate a better deals on group bookings this way as well.
I booked several transfers and tours through Viator, and when transportation wasn’t directly provided by the local travel vendor a company called Grayline transported me where I needed to go. I found Grayline to be reliable and extremely on time, and they had comfortable vans to transport a number of passengers and their luggage.
In many cases, Grayline is who you will need to work with to change or cancel reservations if needed. Viator does not offer its customers a phone number, so you will either have to work through Grayline or email them at email@example.com. I found Grayline to be efficient with the local vendors to make these types of changes. At one point they even rearranged my schedule to fit a tour in that I wanted to do.
In the case of airport transfers, Grayline was extremely reasonable. They were on time and the cost for round trip transfers was little more than the cost of a one-way taxi. The round-trip transfer cost from the airport in Los Cabos to the hotel and back was $31. A one-way taxi into Cabo San Lucas from the airport costs about that much. Be sure to confirm your pick-up times for each leg of the transfer the day before as they sometimes pick up other people, and they may have earlier flights than you.
No matter what company you book your activity with, try to book priority tours in advance and in the beginning of your trip. This will secure your spot in the case of tight booking and if the trip gets cancelled (as they sometimes do) you will have enough time in your itinerary to make adjustments.