I just thought: They could've made a theme park pack in Sims 3, where the amusement park is one entire world, and each lot contains a ride or attraction. I know there are store items for carousels and roller coasters, but those are small potatoes.
I think the concept would still work in Sims 4, where each "neighborhood" in the theme park world is one theme in the park, like Disneyland. e.g. One neighborhood is space-themed with space roller coasters and flashy arcades.