Not Gilligan's but...

...Governor's Island! Join fellow Over 60 Hikers for a walk around the entire perimeter of this island, situated at Governors Island is a 172-acre island in New York Harbor, with an easy, quick ferry ride across from lower Manhattan. Now partly under the National Park Service administers for a small portion of the north end of the island as the Governors Island National Monument, the island has a long and interesting history. The native Lenape Indians originally referred to it Paggank ("nut island") because of it's abundance of nut-bearing trees such as chestnut, hickory, and oak. The Dutch translated this into Noten Eylandt, then Anglicized into Nutten Island.
The island's strategic location caused it to be used as a military installation as far back as the Revolutionary War. Two former military fortifications named Fort Jay and Castle Williams are the result, which are still intact today. If open, our group will climb up onto the ramparts of Fort Jay for splendid views of the harbor.
It was in the late 18h century that the island was renamed Governor's Island. From 1783 to 1966, the island was used as an United States Army post. The United States Coast Guard came in, remaining there till 1996.
Following its decommissioning as a military base, there were several plans for redeveloping Governors Island (Thankfully, this never happened!) It was opened for public use in 2005.
Our group will meet at the Governor's Island Ferry Terminal at 9:45 a.m., and board the 10 a.m. ferry across. Seniors (like this group) can ride over FREE.
We will go all the way around the island, ending back at the docks whereby we will board the next ferry back to the concrete jungle. We will have a nice lunch as a nearby diner, before heading home.