Fresh air, zero light pollution, zero traffic or background noise.

The thing that took me longest to get used to after moving to the ciry was the noise, even in your backyard in the suburbs you can hear constant hum and drone, the occasional loud motorbike or distant ambulance.

That and never seeing the milky way again, sometimes on a new moon i can see like some stars in the scluster, but not the absolute cloud of endless stars you see when your 3hrs from the nearest city.