Spend your fourth day in Gijón exploring its fascinating museums. Begin with a visit to the Museum of the Asturian People, where you can learn about the region's history, traditions, and folklore. Next, head to the Evaristo Valle Museum, a contemporary art museum set in a beautiful natural landscape. Wrap up your museum tour with a visit to the Railway Museum of Asturias, showcasing the history of trains in the region. In the evening, relax at one of Gijón's cozy cafes or bars.