I quadrupled the size of the landscape in Dink and made a Mega Park sort of thing. The working idea is that all rides--excepting some duplicates--are enabled by default, so no research is necessary. The goal is to build ten roller coasters (of different types), each at least 5908 ft (1800 m) in length and with an excitement rating of at least 7.
The interesting thing is that I'm not entirely sure that this will work out as planned. I wanted to have money be part of the park's challenge, but the editor only lets me enable that specific kind of goal if I disable money. However, I was able to disable money, choose that goal, and then enable money again in the editor. I'm hoping that this won't mess with whatever system checks whether the goals are completed.
My goal was to ensure that, despite the very lofty victory conditions, players would have to start out small and work their way up to the reputation of a park with giant coasters. I mean, the maximum loan is currently 35,000$ bux, so there's some slack at the beginning, but that's definitely not enough to start building a bunch of super mega thrilling coasters right away.
I'm hoping that after I'm confident enough about it, I will be able to start up another succession game. It could last quite a while and become increasingly entertaining as the park expands. Perhaps I can do the same sort of goal in the Kalm Kliffs as well.