I don't know how much you have to spend, but Karen and I spent a long weekend in Spring Lake for our honeymoon. We stayed at a great B&B:
www.seacrestbythesea.com
There are several others in the area that are nice, and not as expensive.
Look here for others:
http://www.njinns.com/
http://www.bnbfinder.com/
- Justin