Hi
I’ve only just joined the forum so my reply may or may not be of any use.
But I would recommend going to La Azohia for a day out there’s a lovely walk along the promenade and great beaches with a little fishing bay and a couple of nice restaurants along the way.
In between Puerto de Mazarrón and on the way to Camposol is the Mazarrón country club development which has a fantastic outdoor pool snack bar palm trees etc and you can use this facility for a cost of about €5 per person per day
Cheers Jim