The Outamax River rapids need some major improvement when you have the wide section of the track left, right or the wide both sides. Remove the preassigned path and rails in the centre for the rafts to have them move about a bit more freely, like they do in real life; they don't all follow the exact same path, add some steeper drops, and maybe add some step drops like going over a waterfall, not talking huge drops, maybe 5 or 10 meters just to make the ride more exciting, another sugestion add some scenery and naturer pieces that can interact with the rafts (if theres a rock in the river flow, and the raft hits it it bounces off)