My friends just returned from 2 weeks in Tulum. During their stay, 3 robberies occured. Thieves would enter the cabanas and steal whatever they could. In one instance the laptop of a fairly famous musician was stolen which contained all of his material from the album he was working on.
To confirm this, I talked to my friend who owns a house on the beach as well as the manager of one of the hotels. They said it was happening.
I was told they now have a gate stationed at the entrance to the hotel zone. Has anyone seen this? Who man's the gate? Private security or police?
I would caution anyone who plans on bringing a laptop, jewelry, photography equipment, ipods....to make sure your room has a save large enough to secure everything you need to keep safe.
My friends ended up keeping their stuff in steel suitcases secured by cables and locks.
Get in touch with the management of the properties you are staying at. Ask them about safes and security. And make your determination of what you will bring based on what you can safely keep in your room. Nothing puts a damper on a vacation like a robbery.
Sadly, though, I think all hotels/bungalows will need to do something to ensure that your valuable are safe.
Of course, you can just bring a bathing suit and book....but people don't do that anymore.