Hi Sadie,
Sorry, that I'm such a latecomer to your original question.
Wow, you've had so much advice from everyone, which just goes to show how much the Costa del Sol has to offer.
We moved over here from the UK in October 2006 and absolutely love it. It's a completely different lifestyle to what we had before. We live in the stunning Axarquia region of Andalucia where we are surrounded by olive groves and almond trees. With the mountains offering a spectacular backdrop.
My advice to you would be to split your time up into possibly 3 different regions of Andalucia so that you achieve the best variation out of your time here, encompassing perhaps a mix of costal, cities and rural.
With your husband not being keen to drive, have you considered a part of your holiday to include private touring, whereby you can choose exactly what you want to see, where a driver and vehicle is included?
Best of luck with your plans. I'm sure that you'll have a great trip.
Cheers.
Jess