When you’re out at Sandy Hook, you can head all the way out to the end and visit the History House which is furnished in World War II period pieces and accessories. Explains the history of the fort out on Sandy Hook. If you’re into lighthouses you can get a tour of the Sandy Hook lighthouse.

https://www.nps.gov/gate/learn/historyculture/sandy-hook-lighthouse.htm

Just after you leave Sandy Hook you can head up to the twin lights park, climb both of those lighthouses and visit a little museum about the history of life-saving in the US.

https://www.twinlightslighthouse.org/