The experiences offered in this tour were outstanding. The Tulum Ruins were accessible and our tour guide had a lot of helpful background and interpretive information. The Grand Cenote was beautiful, and our driver not the guide more on that below explained the history and geology of the cenotes and the sacred nature of the cenotes for the Mayans. Finally, the snorkeling opportunity at Playa Paraiso, off the coast of Tulum, was a once-in-a-lifetime opportunity. Our driver, Orlando, was absolutely wonderful: warm and friendly, easy and fun to talk with.
The tour description was a little misleading. The tour provider offers several different combinations of tours in the area, and they shuffle guests between vans according to which options they've chosen. So, for example, for the Tulum Ruins tour we were with one driver and our guide, Sandra, but after the tour Sandra and the first driver dropped us off at the Grand Cenote with our other driver, Orlando. We didn't see the guide again, which was OK because Orlando was wonderful guide too. This shuffling was a little disconcerting while it was happening, although again, we were glad in the end because Orlando added so much to our experience.
Also, the description says the tour is available in Spanish and English, but that might be the same tour. We had two Spanish-language guests in our group of about 8 people, so the guide said everything in Spanish first and then translated to English. I was able to follow along reasonably well, though I certainly didn't learn as much as I would have if the guide hadn't needed to translate everything, and it seemed as if the Spanish explanations were longer and more frequent than the English translations.
Finally, and this is a small point, our guide Sandra explained that snorkeling equipment was not included at the Grand Cenote, though after returning home I noticed the description includes it.
I would return to this tour provider and to the Viator network primarily because we enjoyed the part of the tour that Orlando managed for us, and we liked him so much he was a great ambassador for Viator and Yalku the local provider.