One look at Zulum's pool has a way of eliminating any planet-saving stress.Maybe you'll run into Sienna Miller on your Mayan Riviera vacation too — thoughprobably not like this.The ruins of Tulum are a must visit.Who said Eco Tourism has to be roughing it?Packing your beliefs Summer vacation two-way: Eco-friendly travel can still mean luxury travel in theMayan Riviera Clay RobinsonMay 15, 2010 | 6:09 pm