1 Take comfortable walking shoes as it is very much a city to walk, you need to look at the buildings, sit at outside cafes and bars and cross the bridges. There are large areas which are cobbled so comfortable supportive trainers are ideal.
2 Look up, see the mosaics and sculptures at the top of the buildings in the historic areas.
3 Visit the museum of Illusional Art for a perfect view of the astronomical clock.
4 Keep change for transport tickets and public toilets.