We are visiting Cozumel this summer, and were considering doing the Tulum excursion. Our kids will be barely 11 (DD), 9 & 7 (DS's). I am looking for comments/suggestions/warnings about doing this excursion with kids that age. It seems like a long day from ship to boat to bus to tour to bus to boat to ship. Please comment if you have any experience with this excursion. I expect we will return to Cozumel, so this isn't a "once in a lifetime" thing. If not Tulum, what do you suggest? Thanks for the help!