A "Nintendo Space World" would be cool. Kirby, Samus, Captain Falcon, Fox McCloud, and Ness from Earthbound would all be at home there, interacting. If Nintendo ever did their own park, you can bet some or all of these would be represented.
That said, Legend of Zelda and Pokemon (co-owned by Nintendo) seem more realistic. All other IPs (including Splatoon, Animal Crossing, etc) seem more niche. Good for merchandising under a "Nintendo Store," but maybe not recognizable enough next to Mario, Link, etc.