We will ne going to EDR in less than 2 weeks and plan on going on the snorkel excursion at Xel-ha. Has anyone been to Xel-ha? Also is it recommended to do both of these excursions, Xel-ha & Tulum, in the same day? I have read that you can go to just Xel-ha, or just Tulum, or both....any recommendations are appreciated! Thanks!