Just to clarify - the easy answer would have been to not build the land around stock, oversize figures of the movie's Main Characters. Have them exist in their walkaround forms making regular appearances throughout the land, conceive the whole thing around us being shrunk to their size, and then scale everything else around us accordingly.
It's not like this is some hard-hitting assignment. Pick a scale that serves the concept and then stick to it.
And build in some freakin' shade, for chrissakes.
Exactly, and then the fun imaginative stuff can come from the oversized things both toys, but also non. If one thinks back to the first film, which is odd that they could not even look at the fun of the source material for inspiration such as things that are not toys that they interacted with. So much of the humor and whimsy in that movie comes form those moments.