I think I'm actually going to be coaching at Coble this coming summer! I have some ski school experience (3 team trips to Bennett's). You're definitely going to want to bring/buy glove liners, Masterline makes a solid pair that retails for $9 I believe, best investment I've made to date. Your own equipment is optional, and if it's a travel hassle then I wouldn't bother with it, they provide whatever you will need! Then, just make sure you're in shape, because if you're going there after doing nothing all winter, you're going to be tired by day 3!
I personally know April and Chris, they run a fantastic operation out there and are wonderful people. You're sure to love Coble!!
Hope to see you there!