I was told not to swim at Cow Bay when I was there late November because of the stingers. Even if the locals advise you against swimming, you'll still be amazed by its beauty.
I took a great snorkling trip with Odyssey H2O from Cape Tribulation, and they came to pick me up from my accommodation near Cow Bay.
www.coconutbeach.com.au/odyssey-h2o/
Another thing I really enjoyed was the guided night walk from where I was staying (Crocodylus). The guide called Possum was a real character. I'm fairly sure it was something you could book on to even if you weren't staying there:
www.crocodyluscapetrib.com/
Although obviously I don't know who the chef is now, the food was good at Crocodlyus and you didn't have to be staying there to eat there - some locals came and a lady from a B&B.
Hope that's helpful.