Are you living on Sulani or on vacation?

I have Sims everywhere, but Sulani is my favorite. I'm not sure what the areas are called. I have one at the base of the volcano for now, until he can afford to leave for the empty lot in the same area or when I'm not too tired to build his perm house. His twin is living in the big empty lot on the left that's half in the ocean. They're the only families of mine in the same save.