Trogir is a lovely little town, a big like being inside a game of Cathedral (if you’ve ever played the game).
Close to Split – fabulous city – but a long way from Plitvice, which was one of our must-see places in Croatia (and which was fantastic). Krka Falls were pretty good, too.
There’s also quite a good walk up a gorge which isn’t too far away, as I recall.
The only thing we found with Croatia was that there were still quite a few uncleared minefields around – did not encourage straying ff the beaten track. May have changed since 2007 though…
I’d imagine anywhere down the Adriatic Coast is going to be warm in September. They may even have finished the Magistrala past Sibenik by now, which would be nice! (And would cut some journey times down rather!)