I live in Montreal so ski lots of Quebec areas and I went to college in Boston so skied lots of north eastern US areas. No question, Tremblant is best for mix of skiing / partying. Sugarloaf has better terrain, but nightlife is pretty bad. No point in going to Killington for nightlife, it is the same people as in NYC. And the crowds at the north east US areas like Mount Snow, Killington, Whiteface, etc. are brutal. Tremblant definitely worth going the distance. But you'll want 4 days of skiing at least. If you do decide on Tremblant, check out tremblantinsider.com for insider deals and advice.