Now, if it was an attack croc like the attack rabbit that went after Jimmy Carter, that's a different story. I always thought crocs weren't that aggressive, but never having lived in gator country, I don't know. I would instinctively avoid inner tubes, but I think I'd feel safe in a boat.
Another story I read said the alligator was startled by the kayak and started thrashing, tipping the boat over. Both the man and the wife went into the water, and the husband allegedly tried to save her. He received no injuries. The skeptic in me says this is a good way for someone to get rid of their pesky wife, especially if there was no other witnesses except the man and the gator. Just saying.