Hi Hope, I am also going on the Andalucia walk on the 12th. Love walking and found all the essential items you need are good walking socks,20/25Ltr rucksack, drinks container, hat/sun glasses and a light weight waterproof jacket. If you have been oversea's to a sunny country before clothing you will know about. Looking forward to this trip and meeting new friends also. Bye for now. (PS. a good camera is a must!!)