With kids, give Game of Thrones Walking Tour a miss.
If you love the show, the recognition hits are genuinely fun and a good guide weaves in real Dubrovnik history too. If you don't, it's a slow loop past streets you could see free in twenty minutes. The honest catch: the standout 'shame steps' are the Jesuit Stairs, which are free and always there — you're paying for the guide and the fandom.