My friends (who live in Almeria) took me to this alcazaba before we headed off to the beach. Free entry (perhaps because I was with locals). Heat wave was still going strong while I was here at the end of July so I was basically burning the whole time we were walking around. There is some shade in the garden areas and some of the rooms you can walk into provide slight relief so make sure that you're adequately sun ready! SPF 50, water bottle, wide brimmed hat, etc. There are some taps onsite but I wasn't sure if it was safe to drink. I guess it's there if you're desperate but perhaps don't risk it or just ask a staff member. I think when I'm back I'd like to go at night time. During the day is fine if you're on a time crunch (which I was) but just be prepared for the heat. Great views once you're at the top and there's some relief from the sea breeze. It's quite an amazing structure steeped in history so lots to read up on at the site and also on their website. My friend told me that the the restoration of this site has been in the works for many years. There are parts that are still being restored (you'll probably see some of the stone masons at work onsite in the Almerian heat!). I'm not sure if guided tours are offered but have a look on the website. Being here definitely takes you back in time and I'd recommend adding this to your itinerary. Take a snack, find a comfortable seat and let the walls speak to you!