I always loved the Mario 64 Entry Portals, But it was probably just becasue they were so wavy wavy.
If there are separate entrances, I would love to see them be more like Banjo-Kazooie, Rather than Tooie. I think of Tooie as a good start for the open world feel, and Kazooie as a good start for the separate world feel.
But if there is anyway to integrate a wavy wavy portal entry I'm all for it 100%!
Animation and Computer Science Major at Ball State University
"Ahoooooooooyeeee! ooooh oooh oh" - Kazooie