The thing with the drinks and nightlife seems weird to me,people say the usual 'its an islamic country!',but then so is egypt and to an extent,although secular so is turkey,and you can get anything you want whenever you want in both,and as for dubai and the emirates,well....!
maybe it's just not developed enough for us yet,perhaps best waiting til we're considerably older and happy to stay in the hotel and go to bed by midnight
I think the key here is that, yes, most of the population in Tunisia is Muslim and on the whole quite conservative in nature but it is also quite a secular society and the existence of the local alcohol industry that pre-dates large scale tourism suggests that there is also a strong local market for alcohol - it's just that it's customary to drink it in private in the home and not in bars in public. I think that the real issue is that different countries tend to target different type of tourists and I don't think that this is a development issue. Speaking personally, I don't find anything weird in a country wanting to achieve a particular balance between local culture and the needs of visitors and each country is going to do this in their own way and the results will, therefore, vary.
The Tunisian tourist industry and the resorts themselves are now much more developed than they were when I first visited but they've still not got heavily into a bar culture aimed at tourists and if you look at the Tunisian tourist office's advertising they tend to push it as a historical/cultural destination with beautiful beaches for relaxing on in between doing the sights. To be honest, at a national level I think that they are trying to encourage the family market and those who aren't particularly looking for a busy bar culture. And to a large extent, the comments on this forum suggest that they have been successful in this and, if posters here are typical of those who visit Tunisia, they have built up a quite a decent customer base of regular return visitors who are looking for exactly the predominantly low key hotel-based product that is on offer.
For me, one of the reasons why I don't now visit as regularly as I once did is because it is already increasingly more developed than I tend to prefer. Hence why I now tend to go to one of the quietest of the Canary Islands for my annual fix of sunshine before winter sets in instead of Tunisia. So this is a difficult balancing act for a country - attracting more visitors looking for one thing, can result in turning off visitors looking for something else. On the whole I think that Tunisia has managed this better than many places and why so many regulars on here love it because it still feels relatively 'real', unspoilt and different whilst having made a real effort to develop their tourist industry but in their way. It provides nightlife but not too over the top, it has a clubbing scene if you know where to look but it's not in your face if you don't want that, it has bars aimed at tourists but not too many that the local character disappears. They've aimed at attracting a broad mid-market type of tourist with a sprinkling of both more budget and more up-market options and it seems to me to have been pretty successful at cultivating their target market.
I think that they have also taken a conscious decision to attract a wide range of nationalities - in the hotels that I have stayed in French and German visitors tended to outnumber British visitors. The whole Thalassotherapy tie-up with many hotels is clearly aimed at attracting French tourists looking for a spa experience. They definitely welcome British visitors but aren't wanting to put all their eggs in one basket and haven't gone all out to provide what the mid-market UK visitor finds in Spain and the like.
From the sound of things, PEK is likely to be your best bet for finding what you are looking for but I suspect that you are much more likely to find it somewhere else entirely. Forgive me if I'm making too many assumptions but it strikes me that what you are asking for is confirmation that you'll find somewhere with the sort of 'bar street' or 'strip' that exists in Albufeira or on the Canaries and some of the Greek islands and I'm not so sure that it does exist in Tunisia, even in PEK. I don't know Tsilivi so can't compare it but providing a bit more information on some of the other resorts that met your needs might help people here more easily tell you if what you'll find in Tunisia is comparable.
SM