The main locations for the conference are marked in red:

1. Bahía Hotel
2. Hotel NH Ciudad de Santander
3. Facultad de Ciencias
4. Restaurante Miramar

The tunnel connecting Puertochico (close to NH Hotel) to
Avda. Los Castros (university street) is marked with a red
dotted line. Facultad de Ciencias is not far from NH Hotel
using this tunnel (though this walk is not very pleasant).
It is also possible to go up the hill; the walk is steep but not
too much.