I sailed from Split to Dubrovnik and back with www.bluereefyachting.com last year and had an amazing time! You need two weeks for the route but it is beautiful. Korcula was one of my favourite islands and towns - just so unspoilt! The winds were varied, but we went in June which was probably why. There are also lots of new and modern marinas along the route if you like staying in caravan parks with good facilities...personally I prefer a good town quay! Dubrovnik is also just stunning...finally Blue Reef Yachting were very helpful and I can highly recommend them.