Killington is fun, it has the most trails in VT, lots of variety. Stratton is pretty good, but its expensive and usually pretty packed. Mount Snow if you're looking to ski park, but it doesn't have real great freeskiing. Okemo is another good option, nice park, and good freeskiing.
If you're willing to drive for a few more hours then i would definitely recommend hitting up a mountain in northern vt. Smuggs, Jay, Sugarbush, Stowe, ect. Can't really tell you about those though because i live in southern vt and haven't skied up north very much.