2:21P.M. for 34 minutes
My GPS has finally "found" Runnymede Park itself; there's actually a parking lot and entrance to the hiking trails.
From there, you're walking on very uneven trails, progressing from dirt to gravel to straight up rocky ground, all the way to paved paths.
There's very little in the way of amenities, and it's sometimes a tough scramble over rocky ground, but it's a lovely park, well worth exploring.