We couldn't get tickets with a tour to the Alhambra on our brief holiday in the area, since we had left it too late to book. But then we found the Granada card and booked a seperate tour without a ticket, and it turned out to be the best thing ever. We had total freedom to arrive and enter the Alhambra, we used public transport, which was very easy, and the additional access to the different museums is a great way to spend 72h in the area. On top of it, the price for the card for 72h including entry to the Nasrid Palaces PLUS the independent tour was still cheaper than a ticket with a tour to the Alhambra ONLY. So this card is definitely the way to go, I also appreciate the separate bus ticket cards that are rechargeable and all the additional access to museums and other points of interest. Don't miss the cathedral!