Alhambra
Palace, Fortress, Historic Site
$$
Make this the main visit of the weekend: the Nasrid Palaces, Alcazaba and Generalife gardens fill three to four hours. Book the Alhambra General ticket well ahead; your Nasrid Palace entry time is fixed, and you need the original identity document used for the booking. Fit the rest of the complex around that slot. The gardens and palace courtyards are part of the visit, so there is no need to buy a separate Generalife ticket.