I would let them free range and see what happens. I don't think they will run away from home, lol. Their coop (home base) will be pretty well ingrained in them by now.
My guinea hens are starting to get old - I have had them for almost 5 years, and they came with the place. They are free-range all the time and I hardly ever close the door to their coop. But with getting old, they are getting lazy also. They no longer go to the neighbors to visit - she asked if I still had them because she was missing them at her bird feeder. She puts sunflower seeds on the ground for them, lol.