A conference on the Costa del Sol sounded like a good idea. A four day break in sunny Spain away cold, grey North Europe was wonderful. Our conference fell over the last week end in March and the Costa del Sol had been awake from its Winter sleep for almost a month. Most restaurants were open, but not all the facilities of our hotel were open. The sea was a bit too cold for swimming, but the sun was warm enough for tanning.
One thing to avoid - the many restaurants on the beach. We tried them a couple of times and were disappointed. Rather stick with the solid ones that are not built on the sand.