If you make the waterslides rideable that would be great! If you need help on the project with 3ds and what not, feel free to send me a PM as I would be glad to help out!
Pretty sure my personal project thread has some screenshots containing waterslides in there but you might actually release yours first since I'm kinda lazy ATM and mine is more of a test than anything, and it contains coasters too. Or maybe an excuse to have scenery to interact with. Did you use the NL1 construction kit? I feel like that's easier to produce smooth turns than SketchUp's follow me tool but scaling and making anything other than enclosed slides can be tricky.
It has been some time and I have some good news that the water park is still alive but a storm is brewing from our sources this storm will be here on the 19 take shelter or it might blow you awayyyyyyy