OP
SUPERSTARDJ01
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If you're going there in the winter, consider the manatee snorkel at Crystal River. If you don’t get to Florida much, it is a unique once in a lifetime thing to try. It is not far from Orlando, and is something that even the non-divers in your family can enjoy.
I dove with American Pro last Christmas. They have a trip where you snorkel a bit, then go back to the boat and gear up for a short easy one-tank dive in some caverns below the manatees. I had no problems being only OW at the time.
I went last year around Christmas. At least 50 manatees approached and swam around. My parents came along just for the boat ride. When I was swimming back, I noticed my mother messing around with a rope that was dangling in the water. She later said that she was playing tug-o-war with a manatee next to the boat.
Unfortunately we arrive on 21/08/12 and are there for a short 3 weeks.