There is nothing at the posted coordinates, but they are near the starting point for the Wherigo tour which is also a good spot to launch your boat.
To log this Whereigo tour you will need to get yourself to the Great Beds Lighthouse while running the Wherigo app via a smartphone, pocket-pc or Wherigo enabled GPS receiver. Upon reaching the Great Beds Light you will be given the coordinates for the final location which is a physical geocache that can be found right in South Amboy's Raritan Bay Waterfront Park. This beautiful park is open from dawn to dusk and features a playground, multi-sport fields, memorials, a few miles of paved walking paths, a covered pavilion and of course a great view of the bay and Great Beds Lighthouse.
The Great Beds Lighthouse cache by President3 does a good job of recounting the history of the lighthouse.
If you are interested in more information, local bloggers Morgan-NJ have put together a wealth of info including videos of the interior of the lighthouse.
This cache is certified Central Jersey!