I went wakeboarding while i was in cancun a couple years ago this is the guys site that operates the wakeboarding
http://www.waterskicancun.com/index.html
If you do be SURE to call and make arrangements with this guy before going there.
he had a couple wakeboards but they were really old and one of the bindings were broken. i would try to see if he has updated them. if you have the luxury of bringing your own stuff i would.
if you wakeboard at this place it is on the lagoon. you might look into wakeskating behind a jetski so you could do that on the crystal clear ocean water.
any ways hope that helps if you have questions let me know