I hear that fall is an excellent time to plant new trees. If you are thinking about adding some tallish trees to your land, you might consider that here in Western North Carolina, trees provide most of our nectar for honey. In the spring you'll be wanting Black Locust trees and Tulip Poplars for June honey. Sourwood trees provide the most sought out local August honey.
Trees will also provide the bees with resin to make propolis, which the bees use as both glue and as an immune system for the hive.
Finally, I've also heard that it helps to plant a smallish tree with low branches not far from the front of your hives. That gives the girls a convenient low branch to land on when they swarm, making it easier for you to catch them and put them in a new hive. I don't know if it works or not. My bees seem to like to go to the very highest branch they can find.