Considering you are traveling with an 80 yr old, I will say the day beds are nice, but lower to the ground for getting up and down. They do come with 2 chaise lounge chairs and umbrella too. The sand around chill island is deep. Very nice area though.
Consider Co Co Beach club. Once inside, everything is easily walkable, paved, with very accessible bathrooms. There is a sit down restaurant that is shaded.