Vail usually opens Born Free on the Lionshead Side first. Accessible via Chair 8. The Gondola is most certainly open, but what is skiable up there is unpredictable! Probably something near adventure ridge (beginners).
It looks like Bear Tree (blue) is open near the bottom, which is a nice way to connect between the village and Lionshead.
On the Vail Village Side, Avanti is usually one of the first to open, and the Northwoods area. Mid-Vail is also usually a safe-bet. WONDERFUL area when it is open. The mountain usually looks a lot more bare towards the bottom and un-skiable than it actually is up near the top!
Hope to see you there you know when!