A long thin island makes a challenging setting to build a selection of coasters.
Pleasure Island park is a strip of land that is only a few tiles wide, yet its length extends from one edge of the map to the other. Note that you have a few tiles of construction rights extending out into the water all the way down the island. Your mission, which is to build ten exciting coasters (of any length) is actually fairly easy, because you'll have to keep it tight to even build ten coasters, and that drives up excitement. The hard part is cramming in a lot of stuff into a little space. Other scenarios that similarly have limited space are Dinky Park and Urban Park.