BEACHES for fun in Benidorm??

Hi all, we are off to benidorm on sunday, we have looked at various beaches but have no real idea if people play there? We are more than happy for strangers to play if mrs likes them. But where do we go for this? Is it possible or is it a big NO NO over there? Please help if possible wityh good directions etc as we leave our house sat lunch. Hope you can help thanks xx