Contact the concierge of the resort, they have ready to go day-trips for you. Especially visit the beuatifull town of Rhonda, Nerja, Mijas mountain and Cordoba. Form Marbella its only a 2 hr drive to Gibraltar, don't forget to visit the Rock of Gibraltar. British territory so bring passports. Play golf on some of the mountainside courses, with Monte Mayor as one of the best.
That was a helpful reply. Do you need to contact the concierge in advance, and if so, how far? We are going in March. Has anyone gone then? We are renting a car. Is it difficult to get around? Our Spanish is limited; how much of a problem will this be?