You may be interested in this bit of news, released April 10th: News Release about Stingray Sandbar
You may want to look into this and make alternative plans.
I feel so sorry that this had to happen. Our family were just there about a month ago, and Stingray city, snorkeling at Coral Garden in Grand Cayman and doing the Dunns River climb were the highlights of our trip. It felt so great swimming out in the "ocean" and being so close to nature. It was beautiful!