Hello CarolAnn
Welcome aboard!
Paul is right - most of the popular beaches have beach chair rental facilities. However, the quality of the chairs does vary considerably and there are certainly no such facilities at the smaller, more isolated beaches.
One possibility that I can highly recommend is the Kelsyus Recline Backpack Beach Chair. They are available on Amazon and elsewhere. At around £45, they are far from cheap, but these chairs are actually really comfortable and being covered in a mesh material, stay cool. They are very light to carry around. The only problem is that they are relatively bulky and whilst they are easy to carry around on you back, as advertised, that doesn't help from the point of view of travelling out there, given the airline restrictions of only one item of hand luggage per person. Still, I would say they are worth an extra suitcase in terms of the comfort and convenience they offer. Kelsyus (
www.kelsyus.com) do various models, including some with a canopy top. The one we bought and use is the "Recline Backpack Chair" which, as the name suggest, semi-reclines so you are more reclining that sitting. None of these are for the fuller figure though!