Being aware of differences in culture is important for any trip. A big example of that is when visiting Spain, don’t get caught out by the different opening times for shops and restaurants. Everything shuts around midday, due to the heat, so make sure you’ve gotten some lunch beforehand. I would advise keeping a little bit of food in your accommodation and using this time for a rest. Don’t be those people banging on locked doors and getting huffy just because they didn’t do their research. The Spanish also typically don’t eat their last meal until well into the evening (think after 7pm at the earliest), so plan out your days and dinners accordingly. You’re a guest in their country so do as they do.