There is some information and additional pictures with a google search. looks like a short-lived nightclub.

http://www.pinterest.com/pin/573997914981145183/

And more info

http://books.google.com/books?id=x9a4db4FvecC&pg=PA64&lpg=PA64&dq=dude+ranch+atlantic+city&source=bl&ots=J6lVwfMxcE&sig=ectLbQwl9F7p6HV5sHivGG4jRoQ&hl=en&sa=X&ei=OPxgVJnKEMT2igLNyIHQBQ&ved=0CFAQ6AEwBTgK#v=onepage&q=dude%20ranch%20atlantic%20city&f=false

only thing that doesn't make sense is that Connecticut doesn't hit the boardwalk. Maybe it did at one point?