Florence of the Balkans/King's Landing
We (3 guys) were there for two days and had an amazing time! Dubrovnik is incredibly beautiful in summer - walking through the historic streets of the old town, climbing the walls to look out over the clear turquoise water of the adriatic. the best thing we did was go on a kayak tour at sunset out around Lokrum island and to a nearby beach inside a cave. Definitely also walk the walls and include the fort to the west, as if you are a game of thrones fan like me you willl be freaking out.
Insider Tip:"La barba" seafood place - everyone says go for the octopus burger but get the calamari, it is super fresh and will blow your mind