My daughter and I went to see The Chronicles of Narnia: The Voyage of the Dawn Treader tonight. I reviewed the book back in 2009, so it wasn't fresh in my head, but all in all I think the movie was fairly faithful to the C.S. Lewis story. There was some evil green mist (why is evil mist always green?) and a "dark island" that neither of us remembered, but otherwise, the plot was as we remembered. I thought that the 3D wasn't really necessary, but my daughter thought it was a nice touch.
So, if you've got one day of vacation left and you're a fan of the Chronicles of Narnia, seeing the movie is not a bad way to kill 112 minutes.