Southeast Campgrounds and RV ParksFlorida Knights Key RV Resort – Marathon, FL By D Randy - August 20, 2015 0 1006 Knights Key RV Resort was a beautiful spot but it is being sold now. In my opinion, don’t bother coming anymore, you will be disappointed. It is here for the demo squad and dying a slow and ungraceful death. It’s not at all what it was a year ago.