Hi I did this tour back in 2010, my very first JY tour! I really enjoyed the excursion to Granada and the Alhambra. We had around an hour free time to wander around Granada after our tour of the Alhambra. It was easy to get around - we were left just off the big square and we wandered around looking at various market type stalls and eating delicious ice cream, a nice relaxing time! I am sure you will enjoy it.
Best wishes,
Bob
PS I really enjoyed this whole tour, especially the excursions to Ronda and Gibraltar. Mijas is a very nice town to wander around during your free time as well.