I took a day trip from Tunis out here, and while it was definitely beautiful, there wasn't a whole lot to do. First of all, the TGM station is under renovation, so you have to switch to a bus (conveniently provided) at Carthage Présidence. That wasn't that bad though. I wandered around and shopped a little bit, but the prices were relatively high. But I encourage you to go off the main path--the tour groups usually only stop long enough for a quick photo stop, but even one block off the main road affords stunningly beautiful views.
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