At the beach? this is a great idea because during the day the sun will move across the sky and a normal task and gazebo will only protect you from the sun for a while as it says in one spot where as with this you can change it to cover you from the sun.
Plant poles on all 4 corners of the patch of beach you are thinking of utilizing. Plant another 2 or 4 at intervals on the outside. Tie pieces of sting from one to the other and hang large pieces of fabric over the seating areas. This not only creates a stunning visual affect, but will also give much needed shade to your guests.