We did not book our tickets for Alhambra before coming to Granada. There can be 8,000 visitors inside Alhambra in a given day. Out of those 8,000 around 6,500 are sold over internet & phone. So for us, it meant getting up early and queuing up in the morning. As it was Monday and not peak of tourist season... we were lucky.
Alhambra has main 4 sites to visit. The main attraction is of course "Palacios Nazaries" the best preserved Moorish Palace in Europe. The palace is quite intact from all the wars that were fought between Christians and Moorish (Arab Muslim from North Africa). The war ended at 1429. I heard lots of tour guides mostly Japanese comparing this to Taj Mahal. As I have never been to Taj Mahal I can not say for certain but I am quite sure it is not that close to Taj Mahal in beauty. Still the works of Moorish artists are really very appreciable.
We spent a good amount of time in Palacios Nazaries, from there we went to Generalife via beautiful garden of roses. From there we visited 'Palace of Charles V' and 'Alcazaba'. This makes the four attraction of Alhambra.
After siesta, we went to the Cathedral and walked around there. That evening while strolling we came across Mexican Restaurant - "Chile Grande". The food was really excellent which reminded me of my Californian days.