If you're aiming for those 10,000 steps, the easiest way to get that done is a trip to Porto (Okay, it might not be the easiest way to get your steps in, but it's our favorite way).
WARNING: Don't go to Dubrovnik unless you want a vacation filled with Medieval history, breezy Mediterranean vibes, rugged coastlines, and centuries-old stone fortresses. (It was the backdrop to Game of Thrones for a reason, people)