Hot chocolate's all the hype these days with Jacques Torres, City Bakery, Cocoa Bar, and MariBelle all pouring decadent brews at their downtown locales. And, while we have to admit that we’re more likely to stop in one of these spots below 14th Street, there are plenty of reasons for heading further uptown during this holiday season—say, for ice skating at Rockefeller Center, a trip to Central Park, or a visit to the Met. The......