I've been following the Hurricane Dean story, and it looks like Costa Maya will take a pretty serious hit from this storm.
From
http://news.yahoo.com/s/ap/20070821/ap_on_re_la_am_ca/tropical_weather
"Dean could be even stronger than Wilma, which stalled over Cancun and pummeled it for a day. The fast-moving Dean was passing farther south, and was likely to deliver a brief but powerful punch to Mexico's Maya heartland.
That area stretches from Tulum south to the growing beach resort at Mahahual, where authorities evacuated hundreds of tourists on Monday. Between the two lies the 2.5 million-acre Sian Kaan nature reserve, with a 1,200-year-old network of Mayan canals.
Government anthropologists said they were preparing 13 archaeological sites for the storm, pruning trees and removing signs and vegetation that strong winds could turn into damaging projectiles."