One of our kids coming with us next month hasn't been to Mexico before. We've been to the Tulum ruins, but not the ones at Coba. We're staying on the beach in the Sian Kaan, and trying to decide which set of ruins to take her to visit. I really don't feel like going to both, so if you had to choose one or the other - which would you choose for a first timer and why?
We'll have a 4WD vehicle, so transportation isn't an issue.