We've discovered that the best way to learn is with a semi-private lesson where you can have an instructor just for your group. We've had lessons with Ken Wilson a number of times and he is the BEST! If you see him, tell him that the Meredith's of St. Louis say hi!
The Discovery Hill is wide, short, and a fine place to learn, even if you have to dodge a sitting snowboarder or two (what's up with that?). But if that hill is closed, you'll be taken to the summit, where another learning slope is located. That's not so lovely.
The summit area can be exceptionally windy, and for the first-timer, it can be a bit intimidating. The view is spectacular, but you find yourself wondering about how easy it might be so slip off the mountain all together.
My recommendation? Go after mid-December (when there is plenty of snow for the Discovery Hill), book a lesson with Ken Wilson, and have a blast!