Take a day and head to Hamilton NJ (same county just 20 minutes south) and check out:
Grounds for Sculpture
http://www.groundsforsculpture.org
Great sculpture/art garden that is recognized worldwide.
It is the brainchild of Seward Johnson of the Johnson & Johnson family.
June is a great time as they are doing a Seward Johnson Retrospective. They have brought many of his works back from all around the world for this summer's exhibit. His sculptures are all over Washington DC, Philadelphia, Gettysburg, NYC, etc... you have seen his work even if you didn't know it was his.
Check out the website and click on the Facebook link (even if you don't use Facebook as the page is public) and you will see Michael Douglas stopped by this past weekend... and the exhibit just opened.
Also the the restaurant on site is called "Rats" and while expensive, it is fantastic... if you are looking for a treat day... but be sure to make reservations.
All the info is on the website...
Pete