There's too much to see in Italy alone. Stay there. That said, Croatia, the Dalmation coast at least and all the islands, is Medieval, quite beautiful. Jadrolinja ferries are cheap and the Adriatic is the cleanest ocean in the world, but fished out. A spectacular cruise. People sleep onboard with no hassles. We were there twice 15 years ago. At that time it was cheap. The wars were over. Food is better in Italy. Beautiful women in both countries. An innocent 1950's feel in Dalamatia. They were kinda lost without communism. The buses throw a drive shaft occasionally and plunge off a cliff. You can hear the U joints clunking before that happens though.