Surprisingly under the radar,Governor's Island is gaining a reputation as a birding hotspot.
At last look, the total species list now stands at 160 species. Breaking down for example prime migration month September sits at 92 species. Now that doesn't mean a high daily number nor rushing to the island on good wind day but potential is there for a relaxed birding tour. Unfortunately the first ferry leaves mornings at 10 am from Battery Park ( 1030 from Brooklyn bridge park). Last day is Sept 27.its worth exploring
Here are links for you to explore
http://ebird.org/ebird/hotspot/L555894?m=&yr=all&changeDate=Set
Ferry schedule. https://govisland.com/info/ferry-schedule
About GI https://govisland.com
Island photo https://govislandblog.files.wordpress.com/2013/12/cbi_0559.jpg
