We went yesterday to SKY Reef, and it was just wonderful.
The food is outstanding, no loud music, and the drinks were perfect.
You can snorkel a long way, and see lots of stuff.
They have a boardwalk to get into the water, with a few steps. It does have large rocks when you get off the stairs, so be cautious.
I asked the Manger if they are planning to put down sandbags or anything to get further out into the water, and he said that they did not want to upset the Eco system. Good for them.
Hands down, I like it better than Palancar, and Corona.