A little walk, after getting into another confrontation with a guard who wouldn't let me walk in the 20th st entrance, despite me having permission to do so directly from park staff.
I told him he could arrest me if he liked, but that I was absolutely allowed to go into this entrance! He started walking towards the cop car nearby...bluffing..and then walked away. We waved to each other on my way out.
Also, stopped to help plant some trees while there, good timing. Too hot though.