This excursion is on teh Western 7-day.
We did the Stingrays/Turtles/Hell tour. It was pretty good!
Hell is given exactly the amount of time it deserves. The rock formations are interesting, lots of joke souvenirs from 'Hell' and yes, they help you mail postcards from Hell.
The Turtle Farm is neat, you'll get to see a lot of them at different ages and be able to hold a young one and take your picture with it.
The Stingrays is somethign I would do over and over, no doubt, was the highlight of the whole trip. There is no way to describe how impressive the experience of sharing the open ocean with them is.