Most of the city's historical sights – wharves, churches and monuments – are concentrated in a relatively small area that makes up the old town centre. This means that a full day and a good pair of walking shoes is all you need to cover most of the main sights. However, with inviting cafés every few meters, a couple of large parks that offer aimless wandering and lots of photogenic old buildings, you could spend the better part of a week exploring and still find something new around every corner.