[2020] Better ways to mark POIs instead of using the paint brush

I put a chest on the street, roughly aligned with the entrance. The primary purpose is to have a place to dump items while doing a quest in that POI, but it also marks that I've been in there. Once I'm using vehicles, I'll pretty much always approach a POI from the road, even though I'll head to the intended entry point from there.

When I make a mine shaft, I build a couple wooden blocks above the surface. I attach the ladder to one side, a torch to another side for visibility, and I put a big sign on a third side to label which resources are in the mine. You could do something similar for POIs.