The problem is you usually don't see them, but they're there...
I'm fairly sure there are no gators in the lake at SeaWorld, but there's also no way to make it 100% gator proof. They tend to move from one body of water to another and the canal behind SeaWorld connects to Shingle Creek. That canal runs right through my neighborhood and I know I've seen gators in there.
I agree, those damn canals in Florida.