We recently did a 7-day cruise from Dubrovnik up the coast to Split, with stops at about seven islands. The sailing there is very sheltered. Croatia has 11,000 islands, I think I recall being told. Some tiny, some big.
We were on a small Croatian cruise boat, but we saw dozens of charter boats at every swim stop, cove and harbor. The water is generally protected by the islands and most days it was flat, the winds are light to medium, at least in September. It looked like great sailing to me. (40-year sailor in Southern California.)