I try to do it every trip what would you like to know??
Basically they offer wine by the glass from opening or starting a bit later they offer wine tastings. They usually offer a White, Red or Port tasting (which comes with blue Cheeses), and sometimes they also offer a more expensive fine wine tastings. You can do the tastings at the bar or you can take the classes to a table. The wines are changed around and tend to be unique but available at specialty stores.
I think the wine tasting bar has some of the nicest CM's in the parks and I love to chat with them about the wines. They are fanatstic!