While the weather still permits it, you should try to make it out to Berry Park, the new super mellow rooftop beer hall behind the automotive high school in Williamsburg.
The views of Manhattan are great and the menu of beers is impressive but be warned – a lot of these brews are quite strong. The German dunkels (dark beers) are always a favorite of mine and currently the HB Dunkel is featured on the menu. Some nights the rooftop bar itself is out of service, but the trek downstairs is not a far one. So far, it's never been overly crowded or obnoxious, which is probably the greatest feature of all.