I just got back from Mammoth this weekend and it is good for this time of year. You could only ski Cornice from the top, but all you had to do was make two turns down Cornice and cut skier's left under the Dropout chutes to find a couple of chutes with classic Mammoth windbuff. I was skiing these chutes all weekend. The Dropouts, Paranoids et. al are too rocky to get in from the top, but using Cornice to traverse in gets you some classic windbuff. I don't ski park but Mammoth has some features and a couple of kickers set up, no pipe yet.