I spend a lovely day at the Campo Juan Carlos, a large park close to the exposition area of Madrid and easily accessible by metro.
Easyjet really is quite okay if you ignore the boarding experience, which I find unpleasant and unnecessarily so. I also think the limitations of the low cost model are beginning to show. The old legacy carriers have clearly done their homework, and you can purchase just about anything as an ancillary service nowadays. But on a low cost carrier, that is only possible up to a point. For example, if I purchase an upgrade on Swiss or KLM, that automatically comes with the priority check-in, fast track security, lounge access, better seat pitch and an empty middle seat.