as to places where mice (and rats) are going to be congregating.
They need water to live. People who travel in RVs like to camp by the shores of lakes and streams.
Mice like to live the shores of lakes and streams. They especially like it if there are piles of rocks, downed trees, big tree roots, tall grass, lots of brush. Those are their preferred spots for building a cozy nest to raise their young.
So basically you are going to be having lots of little furry neighbors come visit you domicile because it smells like food.
In desert areas people like to cook, eat and wash their dishes out of doors and also set up shower tents right by their campers. So the attraction is still there even without a lake or stream. They can smell the water that they are very much in need of and also the food.
Sorry but there is just no escaping those little friendly creatures, they just love to come calling to welcome you into their neighborhood.
Never set out poison, the mice are low on the food chain and you could end up killing the animals that consume the mice. That will lead to an explosion in the mouse populations if you kill their predators.