I'd like a couple of preset signs for ingame cash, one to say "on vacation" one to say "excuse the mess. Redesigning." ,etc.
I'd also like -- for free or ingame cash -- landing zone directors, to automatically bring the visitor to whatever we want to show off at the moment. The markers could be the size of a single squidport tile, but come in four varities -- square of concrete, grass, roadway and tile. Having markers that blend in to the ground would mean we don't need to worry about decorating around some object that doesn't look right in that area.
We would only be able to use one marker in our town at any one time. If I have just redesigned my Burns Estate, and it sits on lawn, id put my lawn marker there and they'd be taken to that spot. If I want to show my new Squidport area, I'd swap out that lawn marker for a tile marker and put it on my Squidport.
Between that nd your sign idea, we could communicate with our neighbors as they visit.