When it comes to drinking, we prefer to imbibe free of industrial dance beats and blinding strobes. Of course, we don't mind the beautiful people who tend to gather at those high-tech nightclubs. That's the great thing about Grasshopper/Red Lights: Downstairs, you can sit at the Grasshopper's long, curved, glass-top bar, gulp down one of its funky cocktails and watch the parade of finely accessorized flesh march upstairs to the faux Victorian parlor known as Red Lights, an opulent discotheque where they spin the usual rhythmic pleasures underneath a lighting system designed by NASA or something like that. The bartenders on the first floor are courteous and accommodating; the folks upstairs do them one better: They're also discreet, as they serve customers in one of the handful of private rooms that you can rent for $75 and up. Downtown's latest playpen is housed in a former jewelry store, which may explain why you have the overwhelming desire to propose to half the people who walk through the door.