Ocean City, New Jersey! My family has vacationed there for decades. Picture the classic boardwalk (2.5 miles), ice cream stands, T-shirt shops, water parks, amusement rides, every version of deep fried food you can (or cannot) think of, including of course deep fried oreo cookies.
Completely over the top touristy beach / boardwalk, and we love it. In the middle of the season it is busy and wonderful with all the stereotype summer beach boardwalk atmosphere.
One huge reason we have been going there so long is that it is a "dry" city! Yep, no alcohol. The "nasty" element is basically not there. NO bars along the boardwalk, NO drunks at night... it is great.
I have no idea about nearby campgrounds.