Yes it is busy and you should go expecting to wait...

Yes it is busy and you should go expecting to wait around an hour. But it is well organised. My kids loved the funicular ride down. We only lasted upstairs for the American falls, that was wet enough for my kids (4 and 6). After that we went downstairs, where is was empty and you could stand behind glass. Perfect for younger ones who are a bit scared of the noise or intensity of water.