Camino de Santiago pendent that has a shell on the front, and "Camino de Santiago" engraved on the back. Comes with a black cord. Pendent is slightly larger than a 50 euro cent coin, about 25mm.
Take the subway from the airport to the Plaza del Sol stop and catch the double decker sightseeing bus. You get an all day ticket and can get on and off when/wherever you want. There are two routes. Take them both and then go back to the places you want to see in more detail.