I generally go to Killington at the beginning and the end of the season because they have the best snowmaking team on the East Coast. So I go there in mid December then I go back in late March because it's the most reliable mountain for snowmaking. The middle of the season it's quite busy on the weekends (only time I can go is on weekends), so I tend to go to mountains like Sugarbush during mid season or Sugarloaf where you need natural snow. The Ikon pass is totally worth it if you buy it in the spring, and ski more than 7 days (total) a year, it is a massive discount on lift tickets. Because you get season passes to places like Sugarbush and you get 7 days each of skiing at places like Killington, Sugarloaf, Sunday River so you literally never run out. Mount snow is not on it, but it has a ton of great mountains. Including my favorite mountain ever which is Big Sky in Montana.