Hello,
I live about an hour north of Rehoboth. Let me ask some people, I've been a few times, but nothing really substantial. There was a big club called the Renegade, but it closed, and there are a few bars that are fun, but I don't remember the name (long story..lots of drinking).
Generally it's a good time, and a nice beach. I think ptown is a bit better, as its more gay, where rehoboth definitely has a mixed crowd.