The Spanish islands set the blueprint for European beach holidays decades ago. There are more than 60 cast off the coast of the mainland, and while many of the big hitters – Ibiza, Mallorca, Lanzarote – have well-worn reputations, they are constantly reinventing themselves. In recent years, many have gained prominence for sustainability, stargazing and smart stays. These are our 10 favourite Spanish isles – plus our top recommendations for where to bed down once you arrive.