im sorry but I am really unsure how you think people are going to get into the land other than the route theyve already built into DK. every building on the ground floor of SNW is occupied, I believe its the 1 up store before you go through the archway to DK, and then the Maintenance building for Yoshi, the other side of those buildings is the fire road and delivery yard for the restaurant, the picture I posted had a green rectangle to demonstrate another portal in and out its easy to screen with trees and other elements to lead into something different
The park has dead ends and no loops because theyre self contained lands, they would have to abandon the whole concept of the park to have loops into other lands