Clinton is a very historial town right off Rt. 78. The center of town has a Lower Mainstreet section with quaint little shops, restaurants and Museums. There is an old Metal Bridge going over the river into that section of town. When standing on the bridge you see the most historically photographed Building in all of N.J. It's an old red Mill with a water wheel by the left side of the falls. It's quite a nice museum we heard, but not open this time of the year. On the right side of the falls is an old stone grain mill turned into an art museum. The Clinton Inn in town , (not too far from the historical area, walking distance ) has wonderful food in an antique Inn atmosphere. The food is very expensive so the specials are helpful. It's a town I love and wouldn't mind living in. If you were to go back to Rt. 78 and go underneath the highway , there is a mall on the other side, which also has a Cracker Barrel restaurant. And on Rt. 78 futher west is also the Clinton Diner with a railroad dining car attached. They have great food and I've been there a few times and highly recommend it.
I think your friend is going to love Clinton, NJ . I know I do.