Theory: Sunset Wilds' Location

Abstract
Sunset Wilds are located in the Windblown Wilderness section of Yoshi’s Island.

Arguments

 * Argument 1: Mesas, which are the biomes featured in Sunset Wilds, also appear in Windblown Wilderness (and other levels from the Yoshi’s Island DS World 2).


 * Argument 2: Wild Shy Guys appear in Sunset Wilds, just like the Spear Guys, the Dancing Spear Guys and all the different types of Shy Guys living on Yoshi’s Island.


 * Argument 3: During the race, totems formed with Shy Guys, Snifits and Toadies are seen. All three of those enemies appear simultaneously on Yoshi’s Island, unlike other places seen in the games.