I am talking about pitting next to the track at the North end of the main grandstand. There are Bathrooms under the stands and you can walk right up and sit in the grandstands etc. It's close to everything (except the staging lanes).

We could pit immediately to the right of the entrance gate next to the autocross, but since the autocross is in the corner the bathroom there is closed. That will force a long walk to any of the full service bathrooms.