Tours of Salona and Trogir

I have not, so I'm sorry if I can't be totally helpful. A friend of mine (with whom I went on a trip to Croatia) went to Trogir on her own after I returned home - from her photos and account, I learned it is very easy to get there from Split (a bus runs there). It's a very small town/village where you can just wander around and never get lost. Unless you're looking for something specific on a tour, I would say that this is an easy place to see on your own at a very slow, relaxing pace. It's really charming and has beautiful churches. You can see photos on TripAdvisor.

We didn't take an organized tour, but we did spend a number of days there on our own. This is a very old town which I guess is technically on an island, but so close to the mainland that there is a bridge connection. You can easily walk everywhere. There are some old buildings to explore, easily explained in any comprehensive guide book, and some of the best seafood and Italian food we've ever had. In my opinion, this is a quieter, much more pleasant experience than staying in nearby Split.