I just returned from that trip (January) and loved every single moment. You go from one fantastic walled city to another (my favorite was Split because of the Roman ruins) and the optional trips (two) were more than worthwhile. Krka Falls is one of the loveliest places i've been, It was my first trip with OAT and I loved it so much I immediately (almost) signed up for two more. Dubrovnk was well worth seeing on its own. The trip was well paced, the food was very good and the program directors superb, I would highly recommend it to anyone. P.S. The ship was very comfortable. The cabins are small but are so well designed you don't really notice it. The captain was delightful and the crew very, very pleasant.