I have no info on the resort itself. But we go down to Sanibel/Captiva annually, for a day at least. Last year, the powers that be on Captiva essentially ruined a lot of beachfront views by pushing up a 12-foot high sand barrier between the ocean and all the beachfront property. It looks yucky, you have to climb over it to get to the ocean. This was post-hurricane Milton which did a lot of inland damage, but favorite iconic restaurants such as the Mucky Duck are suing now, because they lost their beachfront sunset views which they were famous for, and their primary damage was from sand, not water, so this theoretical "protection" probably does more harm than good. I don't know how it is at South Seas, but you might want to check that.
Also of course red tide can be an issue, no way to know this early, though there were some recent sightings in the past few days off Sanibel or Captiva. We had 2 exchanges into South Seas, probably both in December, and one time all was fine, the other time it was so intense we couldn't be comfortable at the beach on about half the days. We found plenty else to do though, and South Seas has frontage on the other waterfront side, so you should be ok if you are easily entertained.
Oh, excuse me, recent sightings were rust tide, not "red tide." I just checked, this doesn't cause respiratory symptoms (which was why we couldn't be on the beach last exchange for half the days) but they say avoid contact with the water. In any case, there are trackers for all this. It's tough when you're locked into a timeshare exchange as far as moving dates, unless you're flexible in activities. And even during red tide, we sometimes could find a beach off-site where it wasn't as bad.
