If you’re flying, I recommend booking your flights through Skyscanner as you can find the best flight deals available. For accommodation, I use Booking.com for hotels as it shows me the best reviews for a property. I use Vrbo if I’m after an apartment or unique accommodation. And to book day trips and activities throughout Spain, GetYourGuide and Viator are your best bet. You can either type in the area and browse the various tours or you can put in more specific activities (i.e. Private Wine Tasting Tour).