Anyone know any real cool places to go in Tunisia?

Going to Tunisia in a couple of weeks and I realized I haven't really planned much, basically I'm traveling between Tunis, Tabarka and the Cap Bon peninsula. So the whole northern part of the country. Of course I've paged through some travel guides and googled some places but I'd like to know if anyone has been there, what is there to do at night in Tunis, some scenic routes, special places of interest etc. I heard harassment of western women is common, is it really bad?, any suggestions to avoid it? Thanks :P