Tours on Governors Island

There are two Governors Island tour meets.
Park Ranger provides free walking tour and explains about Governors Island and meet at front of Cannon at Scossion Duck.
Another tour is via Tram or Shuttle Bus (Not drop-off tour), but it points and goes to South Side of Island, where it comes head on with Lady Liberty and tour guide points you at park tour.
Both tour leave after free ferry arrive.
Everything is free.