I had a friend yesterday talk about climbing trees... But hated the sap and such about it. That's what makes climbing a tree different from rocks guys. The sap, the branches that hang in disarray, the peeling bark, the little nooks and knotholes... It's what makes a tree just that, a tree.
I personally enjoy the sap. I'm not all too fond of being so sticky, but at the same time... The sap has the sweet scent of the tree and is kind of like a badge, and hey, maybe I do kind of like that sticky feeling, if only a little bit.