you're lucky to have a place like that to ride!! (...I especially like your natural history lesson in the beginning! ...Rock, ...tree, ...snow!!!)
Yeah I usually announce if I go over a rock to try to save the guys behind me, then I got friendly with the tree in the process!
My GF and I moved 3500 km from home to be near mountains like this... It was worth the move but now I want to get even closer to them. (Lake Louise is 2 hrs from me, not bad for a day trip but it wouldn't hurt to be closer!)