It was filmed at:
Big Bear Lake, California
Branson, Missouri
Cedar Lake, Big Bear Valley, San Bernardino National Forest, California
Hollyweird usually does a poor job of going from book to the big screen, they really abort the Stephen King books.
If you ever want filming locations, or just more info on a movie, check out imdb.com for all sorts of movie information. Just ignore the comments, there seem to be a lot of kids with nothing to do except mess with the movies and their ratings. You can also find info out at Hollywood.com for most movies as well.