Forget the subway. Now there are innovative—and fun—ways to avoid traffic in two of our favorite cities. Zip around Paris on the back of a two-seated bicycle with Tandem Services (www.tandem-services.com; $1 per kilometer). Sporting a cute orange beret and matching vest, a passionate and knowledgeable guide does the steering—you just help pedal.
New York Water Taxi (www.nywatertaxi.com; rides from $3) runs a fleet of three 53-foot climate-controlled catamarans that make stops at docks around lower Manhattan and Brooklyn. The views can't be beat, and gridlock is a thing of the past.