We went to Blue Spring in Orange Florida. A magnitude 1 spring. The spring is 72 deg year round. Even during summer it was a little cold when you firs got in but you quickly get used to it. You have swim up to the boil and you can easily swim into the cavern if you have a mask and fins. When we went there approx 30 divers in the cave, which from what I can tell is 130 ft give or take. Not something we would do by it did look like the divers were having fun.
It cost $5 per car load to get in. Well worth it for a day of family fun.

Just a quick trip down to Coco Beach, FL. We were right behind the giant tourist trap called Ron Jon's. The water was a little cold, but not unbearable.
People were swimming, but not many. Views of Cape Canaveral and few cruise ships were off shore, include a Disney ship, but I couldn't see which one.
Overall just a few relaxing moments at Coco Beach, FL