Not really in Rehoboth (north of Dewey), but only 10 minutes away. Quiet park. Nothing fancy - basically a big concrete parking lot with hookups. Worked fine for us. Walkway under the construction to the beach, but we never used it.
Great location, quiet, level sites. Staff was not the most friendly, but the campsite was great. The views across the stream to the Amish farm were lovely, and the kids enjoyed the playground. Would certainly stay here next time we visit Dutch Wonderland.