They will probably have a good amount of terrain open. The west wall (blue bowls) will be open, if theyre not already, but the good stuff may not be open (pallivicini). If pallivicini is open then you will have a lot of fun, steeper than anything breck, vail, keystone or loveland will provide, and a lot more of it. As per the other suggestions people listed above, loveland is cool because it isnt very crowded, but nothing really spectacular, keystone is over-rated and there is nothing challenging there save the park. Breck is decent, chair 6, some stuff off peak 10 and of course the tbar stuff is ok, especially if you want to hike, of course the park kicks ass there.
'I would be embarrassed to constantly complain about my life considering all the freedom and opportunities we have today. People that can't find anything they enjoy in life simply aren't giving it a real try.' ~Nick 311