Book everything or leave room? My error in Andalusia

I had booked entrances, trains and restaurants every day between Granada, Cordova and Seville. I saw everything, but when a thunderstorm moved a visit and we stopped in a neighborhood we liked, the program became a chain of penalties and races. Now I would like to understand what elements really should be blocking in high season and what to leave open, without risking staying out of the Alhambra or paying expensive trains. I am interested in a comparison based on recent experiences: indicated travel period, what r…