About 5 hours south of Cancun is Ascention Bay. This is a marvelous and wonderful remote place to fish for bones and permit.

I dont know if you could "see" bones that easy sitting close to the water in a yak. It may be worth you time to see if you could hire a guide for a day to run you out on those huge flats out there. There are a few "lodges" down there. I have used Let it be fly fish inn, with good results.

Bring crazy charlies, small crabs, gotchas and similar flys on 6 or 8's. Most of the fish are in the 2-4 lbs range so you can probably use an 8 weight and not get into to much trouble.

Good luck and have fun

Larry