If you'd love to add a little more culture to your getaway, put Centro de Interpretacion del Mar on your itinerary. See if there are any guided tours or just look around at your own pace.
You'll find this museum in Aguilas. Once you've explored everything you want to at Centro de Interpretacion del Mar, check out nearby Calarreona Beach, Playa de Calabardina, and Playa de las Delicias.