Benalmadena is lovely! The beach is beautiful, and the weather now is gorgeous. If you make it out the resort the cable car is worth the ride for the views, and the castle is small but very cute
https://www.castillomonumentocolomares.com/
Benalmadena pueblo, or town, the old part just inland from the beach resort, is very pretty.
Malaga is definitely worth a day out, hope you have a lovely holiday whatever you do!