For right now, I'll keep my vacation lots to Sulani and the vacation worlds, because I have a map in my head where all the other worlds are within an hour drive of each other on the mainland and they can visit lots in any of those worlds at any time. Granite Falls is several hours north and Selvadorada several hours south and Sulani requires a plane ride, so I'll have my sims who live on the mainland rent a place if they want to experience those worlds, and I'll do the same with Mt. Komorebi when I add that pack since I'll treat it like an island like Japan.
I'll also have sims living in Sulani and Mt. Komorebi though, so eventually I will put a rental or two somewhere for them to stay when they want to visit the mainland. Probably one of the penthouse lots in San Myshuno to start with, as it's kind of central in my mental map.
