Can you walk from the west side grandstands to the other side (so we can get a drink)

You can, however it's much easier to access all the action from the east grandstands. The pit entrances, food, drinks and bathrooms. One other consideration is the sun shines directly into you eyes until noon on the west side.

Yes. There is a crosswalk at the staging lanes.

Yes you can

Yes. There is a pathway behind the tower

Yes, but there is no shortcut so it's a long walk.

Yes

Yes, you can walk around the starting area. It's not a short walk, but you can do it.