My girlfriend and I just spent one week on the island and there is nothing to rave about. The beaches are filthy and the island is built-over with one nondescript hotel after another. Males in the souks and markets can be extremely insulting to Western females ... especially young and pretty ones. The whole island is basically one large hang-out for large groups of Western European holiday makers.
The best one can do to get away is rent a car to get off the island to visit nearby desert communities and the mountains. There is little traffic on Southern Tunisia's highways.