Environmental activist Robert Kennedy Jr. was the center of attention Wednesday night at the New York opening of the new Gant store on Fifth Avenue, reports PEOPLE. But Tommy Hilfiger and Ralph Lauren needn’t worry: Kennedy, 47, who’s been named one of the heroes of the planet by Time magazine, insists that he isn’t looking to launch his own fashion collection. “The environment is my whole professional life and my whole personal life,” Kennedy told PEOPLE. “I spend almost all of my leisure time out-of-doors with my family; fishing or on the water.” Still, Kennedy found time to weather Manhattan’s social waters, as the opening night party benefited his international conservation group, Waterkeeper Alliance. Among those in the crowd of well-connected nature-lovers: Andie MacDowell, “Pollock” Oscar winner Marcia Gay Harden and sex expert Dr. Ruth Westheimer. “I’m very outdoorsy,” conceded MacDowell, 43, as her 6-year-old daughter sat on her lap. Harden, dressed in a cherry-red leather dress, also explained her connection to nature. “I’m a nature girl. I grew up hiking and camping on the Appalachian Trail in Maryland,” she said. As for Dr, Ruth, “I came here tonight because I love when people open their luxury stores,” she said. “I don’t care who can buy it. I don’t care what the price is. I care that they attach it to a good cause.”