Decided to call it quits for the day after this and ready myself for a full day tomorrow.

I had bought the 1 day 'Dubrovnik Pass' for 40 Euros which was a sensible move as a ticket to go up on the city walls is 40 Euros on its own. I didn't use the bus pass that comes with it, but I did visit a couple of the museums that were included, although to be fair you wouldn't have missed anything by skipping the museums included in the pass. The ones that are actually worth visiting are not included.