If you are even remotely adventurous, you've inevitably been duped into a novelty workout class or an overhyped "hot new" restaurant or any number of awful gimmicks. Tragically these things are often billed as the best things to do in NYC. Whether they suck because they're touristy or because no sane person would find them enjoyable, you should avoid them at all costs. For a safe bet, subscribe to the Guest of a Guest calendar where you'll find the city's best events (duh).
[Photo via Sex and the City]