Personally, I'd want to see this in the next pack.
Crazy Trolley, Found at Kennywood.
This ride, which is a lot like the Genie that's already in the game, but goes in a circle instead.
Source: https://www.youtube.com/watch?v=TMoBu1lnWcA
I'd also want the coaster system that's used at Universal for Escape from Gringotts, and simulator rides that Soaring, Star Tours, and Avatar Flight of Passage.