I just returned from a trip to Croatia this past week. Some of the most incredible water I have ever witnessed, not to mention more sailboats in every port that you can count. You will have to study up on navigation aids, as some are reversed from those in the US. Lots of islands and an opportunity to get lost (in the good sense of the word).The sailing press has had articles on that cruising ground. I'm thinking SAIL. If you can't find them on the website see if your charter company can give you a reference.
Sounded like a great place - clear water, good cheap wine, cafes, centuries old hamlets etc.
The Noonsite is not as positive regarding the authorities and fees.