A post-PCT goal of mine has been to set some FKTs in my backyard, and I decided to start with what I figured was low-hanging fruit: just under 63 miles (100k) of nearly flat gravel trail with minimal gear. Unfortunately, I've lost much of my conditioning and I seriously underestimated the difference between walking 3mph and 4mph—my legs felt pretty shot after 7 or 8 miles. But I kept on trucking along for a total of 17.5 hours, which meant success but also being far more sore than I've ever been in my life. Anyway, I just enjoyed the sounds and smells of being outside, and the amount of wildlife was wonderful. And you don't need to do anything stupid to enjoy all of that. Stay tuned for the next episode of eXtReMe WaLkInG.
Regarding unsupported logistics: I carried all food and trash the entire way. No pacers etc. I filtered water one time and filled up one time from an outdoor, public spigot ~10 feet next to the trail (per this website's FAQ: "it seems pointless and arbitrary not to use it").
I turned off my Garmin about 30 seconds after I stopped hiking (see GPX).