This summer, SplashCycle, an underwater “aquacycling” class, started leading workouts in the pool on the rooftop of Dupont’s Embassy Row Hotel. But now that summer has come to a close (or at least, ...

A good hotel room might offer skyline views or a peaceful stretch of ocean, but what if the scene outside your window included stingrays, coral reefs, or even a curious sea turtle gliding by? Around ...