JFYR, Coba is a bit primative and somewhat more unreconstructed than the more touristy Mayan ruins. Avoid the lake (about a dozen Caribbean crocs hang out there) and the poison trees (think poison oak), and take a good set of boots.
As to Muyil - looks cool but have never been.
Originally Posted by cozumelcruising
...just a small hand of ruins still can be climbed such as Coba and Muyil..
Amadeus:09Diamond;Celebrity:10Summit; HAL:87Rotterdam V,89Nieuw Amsterdam II,93Nordam III,94Ryndam III,96Westerdam III,99Veendam IV,01Maasdam V,02Amsterdam III,03Volendam III,03Zuiderdam II,04Westerdam IV,04Oosterdam I,05Zaandam III,06Statendam V,06Prinsendam II,07Nordam IV,08Eurodam I,08Rotterdam VI,09Veendam IV,09Volendam,10Nieuw Amsterdam IV,12Ryndam III,13Ryndam III, 14Volendam IV,14Eurodam;P&O:11Artemis;RC:07Splendour of the Seas,11Navigator of the Seas,12Majesty of the Seas;CDF:14Horizon