Ive always gone to Crystal River (west coast FL) to dive/snorkel with them. We always went in the cooler months too (like Dec, Jan, Feb, March). I dont know if and as many come in during the warmer months (they come in during the winter for the warmer spring fed waters). When weve gone, the water is usually pretty murky and on the cool side too. There were roped off areas where you could not enter, and you could not approach the manatees. If they came to you it was ok. The babies are so adorable. Saw lots of them in the cooler months.
alison