Unless things have changed, general admission will allow you use of the lawn areas in front of both the Hill & Members Grandstand, other than for any corporate areas they may be using.

My recommendation would be the covered area of the Hill Stand (at least that is where I went for many years), however according to the ticketing map that is not available just for Cup Day only.

Therefore, I would recommend the Undercroft as it is covered, but I've never had reserved seats in that area before, as it does not have the elevation that the Hill Stand offers which could be an issue re the number & location of the corporate marquees.

If you are going to stay overnight, I would also give consideration to booking your accommadation asap.