Strictly speaking at the moment you need a valid/Legal reason for travelling to the Mainland from the Canaries. You also need a Negative PCR although you can complete a declaration to say you will get tested within 72 hours of Arrival. There are also controls regarding ‘movement’ on the mainland depending on the infection rates in different municipalities. I think things will change quite a lot before the Summer as the Spanish will undoubtedly open things up to allow City dwellers to travel to the Coast. They did last Summer which led to the second wave but it’s impossible to deprive the Spanish of their beach holidays.