For martini-drinking ambience, head for the lounge at Fort Lauderdale's St. Regis Hotel, where a jazzy score rolls across a vaulted ceiling of blond wood. But the St. Regis, like so many other upscale joints in South Florida, has an unexotic array of gins, and that's bound to rankle the true martini snob. He's liable to follow the scent of juniper berries a few blocks north along A1A to the Trina lounge, inside the Atlantic Hotel. Here one can find Martin Miller's, a brand whose British makers followed their gin obsession all the way to Iceland for glacial waters that are the world's purest. This is perhaps the deft touch of mixology and hospitality guru Nick Mautone, a consultant to the bar and restaurant. Mautone seems to have also imparted a few lessons to the bartending staff, who are wise to the subtle ways of martini creation.