We leave Friday!!

We've only stayed at the campgrounds in the summertime but my kids are begging to swim on one of our non-park days. Is the pool heated? It looks like it'll be about 79 on our first off day. That's too cold to swim in TN, but what about FL? I'm hoping that if we swim around 3pm, it will be warmest. I'm not as concerned about the water as walking back to the site.