The city of Santander offers visitors a number of interesting museums:
-Museo Municipal de Bellas Artes Fine Arts Museu
-  The Museo Marítimo del Cantábrico Maritime Museum 
-The Museo Regional de Prehistoria y Arqueología Regional Pre-History and Archaeology Museum
Enjoy a pleasant walk through the city’s shopping area or around the
  La Magdalena Peninsula   and  El Sardinero beaches  .

From June to September you may directly book excursions to:

- San Vicente de la Barquera, Comillas and Santillana del Mar
- Puente Viesgo Caves
- Covadonga and lakes (Asturias)
- Picos de Europa
-   Guggenheim Musseum   (Bilbao), Laredo and the Altamira Caves  
- Cabárceno Natural Park

Among other options, you may also wish to visit:
- Castro Urdiales, Santoña, Pas Valley, Campóo, Trasmiera.