Hi Gary,
Calahonda is a nice place. Theres a few schools close by: NEIC, Alboran, etc. However I strongly suggest to get a car then as going by bus can be quite unreliable (you never know when they come and in summer its WAAAY TOO HOT to go into a bus with 100 other peopl
).
Have you checked San Pedro/Nueva Andalucia area? Thats a bit closer to Marbella and definitely an excellent school: Aloha College.. Then in San Pedro there's Calpe and some Spanish schools (not sure if they are any good). Although these areas will be more expensive than Calahonda..
Hope this info helps... Let me know if you have any more questions.
Greg