I've looked at the Cinnamon Snail, and I'm definitely considering it, but since I don't have a smart phone and won't be able to check the location before I leave Duchess County in the morning, I'd like a back-up that has a fixed location.
The Cinnamon Snail is generally static week to week, it just changes where it is each day of the week. I know on Tuesdays it's always in the Financial District. I'd guess if you look on their facebook page or something it should list some previous schedules, and I believe every Sunday they post a confirmation of the coming week's locations.
I've never actually had their breakfast foods but I would without hesitation make them a guaranteed stop on a trip of mine.