Afton Alps Ski Area is a really great place to go in the winter. The slopes are well-kept, and are of a wide range of difficulty, so this ski area will appeal to everyone from seasoned individuals to beginners and families.
If you're not too ski- or snowboard-savvy, Afton Alps has an amazing ski school that has been called the best in the Midwest. I know from personal experience that the instructors are awesome -- my boyfriend & his family work there! -- and the prices aren't too bad either.