I'm travel agent in www.sardiniencostarei.ch. Costa Rei, like The beach, even in the high season you can generally still find a quiet sunny spot away from the beach exits and beach stalls. And incidentally: The biggest aspect of this Costa Rei bay is totally free beach. So here you can put your towel and then put your parasol wherever you desire. But if you like to swap this kind of freedom for the relaxation of a deckchair rental, you are able to do this with no issues.