hi enia! One of my favourite chill out places is between Rota and Chipiona at a camp site called Aguadulce. Everyone there is from Sevilla or Cadiz except for the four guiris from Estepona who have been staying there several times a summer for the last six or seven years!
The beaches are all good along there, golden sand and clear clean water. Chipiona is a five minute drive and is a typical Spanish seaside town, with lots of fried fish and Spaniards spending their days on the beach and evenings walking and taking drinks and tapas.
Rota, five minutes from the camp site in the other direction, is home to an American military base and is a completely different town. Neater, more regimented and with a lot more going for it on a night if you are looking for good bars and a bit livelier atmosphere. Eddie's right about the Guinness, although there was once a Spanish barman there who I feel must have been the offspring of an American sailor as he was about seven feet tall
and he didn't do too bad a job! It's quite a nice pub that one, with dart board, pinball, good music and a great terrace in the square, where you can watch the comings and goings. Its a novelty for me I suppose, but its a smashing atmosphere when an American ship is in. There's invariably a lot of good fun and noise and I can't remember ever seeing as much as a glass smashed! The shore patrol chaps do a good job and everyone seems to respect them. I've wandered off a bit here... !! Yes, I like that stretch of coast, I'm sure you will too!
Forgot to post a link to the camp site.. I would definately book if going in July or August, as it gets pretty busy, although you never have to wait more than a few minutes for a hot shower.
http://www.vayacamping.net/aguadulce/b2_en.htm