You can wander through the old town without paying anything. From there you can see the walls and choose to pay to walk the top of the walls. It isn't very expensive - I wouldn't waste time looking to book in advance. There... More
You can wander through the old town without paying anything. From there you can see the walls and choose to pay to walk the top of the walls. It isn't very expensive - I wouldn't waste time looking to book in advance. There is plenty of space so they won't turn you away unless there is dangerous weather conditions!