I'm having a trip this Spring with a stopover at JFK, and trying to decide between a short (2 hrs) or longer (6.5 hrs) connect time. I'm not really familiar with the borough of Brooklyn, and understand it's changed a lot in recent years. With the longer connect time, I should have a good 3 hours to explore one of its neighborhoods. Any recommendations on which parts of Brooklyn would be suitable for a short visit? I'd prefer something with interesting architecture, local character, or a green space -- so please don't send me to a mall.