With Runelords, maps are essential! Seriously!
For instance, there is an encounter with four undead critters in Skinsaw Murders. The information on the critters has them swarm one PC at a time. The map shows this is almost impossible, especially when you consider the terrain is slippery and sloped. If you didn't use the map you'd just have them swarm that one PC... while without it you have the tactical situation.
So use maps and use miniatures or cardboard pawns (of which, Paizo has the Runelords pawns as something you can purchase separately and have almost everything you need).
Do the maps come in the size needed or do you have to enlarge them; If so what size do you recommend?