I did spend some time on my project and I finally saw why one of my “bright” ideas was complete nonsense. At least I can now write up what I have, which, I think, is what I was trying to avoid.
So, about the workout: I did wake up early! And I did start deadlifts early too:
10 x 134, 10 x 190, 10 x 225 low, 10 x 260 4 inch, 4 x 300 8 inch. All were within my abilities.
Then I drove to Forest Park Nature Center and, at about 9 am, started the outer loop. 1:02 (on the button) for the outer loop; I didn’t walk “with urgency” but I stayed deliberate, Then I added the hill on Deer Run, Cardinal, Bee Tree Loop, valley loop and then back with just a bit extra to ensure that I got 5 miles.
Though the mileage was speculative, it more or less matched what the maps have. There was some traffic on the trails but it wasn’t too bad.