Upper Mac is probably my favorite trail on the entire mountain. Lowers not bad either but I do snowboard so the bumps arent the end all be all of skiing to me. Mt. Run is tough to beat though. Always has some of the best snow on the mountain, sustained vertical, and even allows you to showcase for the guys on the lift. Hell they had the Olympic slalom and GS on it in 1980, its gotta be pretty good.