I'm not even bothering to look for fitting pictures. The site is spread out far enough that on foot you may not cover all especially as some require crossing roundabouts, but you should do the bath, villas, amphitheater and the museum. They are all covered by one ticket.

I took the train from downtown Tunis all the way across which costs hardly anything and takes for 30 minutes. Your stop will be very close to the baths.

Overall there isn't much left of the place and I've seen much better ruins. As far as I understand, and don't take my word for it, the city was destroyed in favor of keeping Dougga. It's historically still important but not impressive.

Highlights were more to see the rich area of Tunisia and great lunch at the Tennis club just nearby the museum.