Darin is not retired, as far as the conversation I had with him on monday went!
He is nursing a back issue yes, gonna be a few months till he is back in the game but absolutely nothing was mentioned of him retiring.
As far as Mexico goes, he helps run the watersports/wakeboarding side of the resort, not sure about ownership though. They hired him on to get things going so he goes down their often when groups are scheduled. This resort (all-inclusive) is open to anyone, but the wakeboarding/watersports is additional cost. heres the link to the resort: http://www.acapulcogetaways.com/default.php
I do believe we will see Darin back in action soon.