I really like Jack Frost. The runs have alot of turns and pitch changes that keep it interesting. Difficulty level increases nice and uniform from one side of the mountain to the next, too. Schlepping across the flat at the top of the hill to get from run to run is the only minor downside to that great mountain. I'm not as keen on Big Boulder, with the exception that you can ride nights there, unlike JF. The solution is to hit JF during the day, and if you're not worn out by then, head to BB for the night.