There are some interesting studies around that explore the idea that plants and particularly trees communicate with each other. Some suggest pheromones, some fungus, and some even think trees may be making sounds in a range not audible to the human ear. I enjoy the sounds of trees that are within my range - the rush of wind through the leaves and the creaking of limbs. Getting up close and touching the trunks you can feel the vibrations going through the tree. This article in WikiHow suggests some ways to enjoy trees if you are not currently communing with yours. Some of the suggestions may sound kind of silly, but I can tell you for sure time spent quietly with nature has real benefits.
In case these activities don't excite you, this guy has a more active approach to enjoying nature: