Croatia from the water is a must
We spent five days in Dubrovnik and the boat tour was the undoubted highlight. The Old City walls look completely different from the sea — vast and dramatic in a way that the land view doesn't capture. Beyond the city we explored two of the Elaphiti Islands, swam in clear water, and had a superb seafood lunch. The captain handled everything perfectly and made us feel completely at ease. I'd give it six stars if I could.