In January when I ran my virtual marathon, I had kind of hoped to take the overpass bridge (blue path) off property for part of my run, but since they are doing temperature screenings, and controlling access to DS a little more (maybe??), the bridge to DS from SSR was blocked off and closed until 9-9:30 (close to 10) when DS opened. So just be aware that the overpass bridge and then the bridge from DS to SSR may be closed early, so your best option (when maybe traffic isn’t too bad) is to probably cross Buena Vista carefully, and if you are there late enough return the other way??