Portuguese Site recomendations

We called in a couple of years ago to have a look at Camping Zmar Eco which may suit your required location.  I seem to recall it was quite expensive to stay there.    There is also Campsite Orbitur Sitava Milfontes  which is open all year.  We haven't stayed
at that one though.  The Orbitur sites seem quite popular although in our experience many of them seem a little 'past their best'.