A great way to avoid the crowds is to rent a private home. We rented a villa just south of Cancun this spring. It was quiet and relaxing. We had the whole beach to ourselves. The villa came with maid service, internet access and laundry facilities. It was right on the beach and had it's own private pool. Boogie boards and pool equipment were at the villa.
We ordered several meals to be delivered. With six of us on this vacation, the villa cost each of us under $300 for seven days.
You can see what we got for our money by reading an article I wrote about it here:
http://www.thebusysaver.com/2009/05/...on-part-4.html
I did ask the manager about renting during hurricane season (I want to go back!), he said basically the same thing genie said. He added that if you are at the villa when a hurricane is approaching, they will evacuate you to a safe place inland. It might be a school or another public place.
Good luck! Have fun!