A nice run in western Santander. Enjoy paths through Parque Morales, and a jaunt up to a terrific running track. Optional section on a hilly trail through Parque Finca de la Remonta, with some great views.
Santander is known for its beaches. Sand tends to be soft, but some beaches are runnable. Best central beach for running is Playa El Sardinero, which can be combined with Playa de la Magdalena. Playa de Somo is a good destination beach for running.