This is an easy day trip from Napflio, about an hour by car, we drove ourselves, signage is poor but there's only one road leading here, so it's hard to miss and people will give directions if you're lost (i.e., haven't seen any signage for some time!).
The theatre is amazing, so large and in good shape. We weren't able to attend a performance, but listened to a tourist belt into song, which was fun. The small museum doesn't have too much in it, but does mention the important and well-known healing centre that was at this site in ancient times. We checked out the theatre, which didn't take too long, and then spent the rest of the day exploring the rest of the site. We had a good guidebook, which really helped to know what we were looking at. This is a huge site and there were lots of interesting things to see, yet we were practically the only tourists in this part of the site. Apparently people would come from afar to be healed from whatever affliction and there are all kinds of testimonials of people being healed. Granted, much of the site is in ruin, but you can still sit on the benches where the sick were healed, view the baths and visit the well where they cleansed and purified themselves. All-in-all, it's quite an interesting site.More