If you're ever in Jerez de la Frontera, then you must take time to visit the Alcázar. As soon as you walk through the arches below, you feel like the former Moorish fortress has transported you back in time!
The Alcázar is right in the centre of town, and it's a lovely peaceful place to spend some time, with beautiful gardens to wander around during your visit.
One of my favourite parts of the visit was the municipal pharmacy on the 2nd floor, which still has lots of equipment, jars and containers from the 19th century, as you might be able to see from the photo below.
The views over the city are also beautiful, and it's worth going just to take some shots from the octagonal tower - it's worth climbing the steps, even in the summer heat!
This was the last thing we did on our visit to Jerez, and we could have spent a lot more time here, as there was also an art exhibition to look at too - you might want to do it early in your visit, as the views may help you get your bearings when wandering around!