“Opportunity” looks a little different in the Hamptons, among a group of largely non-working women who are out East for the whole summer, often attending sex-segregated luncheons and fundraisers and trunk shows, socializing in weekday evenings with mostly other women, and working assiduously on their bodies in the presence and with the guidance of female trainers, some of them gay, while their husbands work in the city. These women have autonomy of a different sort, and opportunity aplenty.