Replace geysers with ski slopes. Mile-long slaloms, six mile race courses, reverse gravity on uphill runs, massive ski jumps, switchbacks, crossovers.
And litter the place with weird things. Trains floating in the sky. Rularuu warming their hands by an Animus Arcana in chains. A lone Nemesis Jaeger running past and jumping into the void, only to reappear where it started, and exclaiming with glee the entire time. Reflections sitting at a table, drinking coffee and talking about being reflections. The occasional Giant Monster, untargetable and without attacks, looking confused as it slowly sinks into the ground and disappears. It's a dream world, make it dream-like.