Coordinates will take you to stage one, where Mrs. P.T.T.M. hangs out at (and occasionally works).
There you will find a date, which is in 2 places; use the date to solve for the final location which is nearby.
DATE = ABCD
Final Coordinates are:
N 41 35.ABC
W 072 53.D24
You may even spot "Anita", our geo-mobile, which has a travel bug decal you can "discover"...and feel free to stop in and say "hi"!