DS will be 6 when we head to the world in March, and probably a bit shy of 48ish inches. He really likes rides, except when they have those weightless drop moments. He's pretty brave, and he'll try just about anything, but as soon as that bottom drops out of his stomach, he's terrified. So, my question for you experienced folks is this: What all should we AVOID for this? He HAS done a log flume before, so I'm pretty sure Splash will be ok. Thanks!