Rice,
I'm sure more moms will pop-in to share their thoughts, but I wanted to provide a different perspective on Shakespeare for you to ponder before you just "skip it." The reason that we made the Shakespeare part of the guide an option was due to the fact that some families may not want to expose their kiddos to some of Shakespeare's themes and situations. Yet, there is much merit (and usually enjoyment) in reading Shakespeare's plays as tales, especially if not done too young.
Listening to Shakespeare's tales and reading them on one's own are two different types of skills and experiences. So, if your son has not read these tales to himself already, and taking into account that he is an older student using this particular guide, I would not be quick to omit anything.
Whenever you start considering adding something to a guide, it is a good idea to step back and make sure that you aren't skipping something already schedeuled within the guide in order to do so. Each part of the guide has its purpose, and Shakespeare is no exception!

It's purposes are as follows: To expose students to Shakespeare in a lower-key way when compared to reading the actual plays, to gain familiarity with Shakespeare's characters and plots (as the plays are referred to so often in other books, commentaries, movies, articles, etc.), to stretch students to keep track of multiple characters and subplots which is a stepping stone to reading longer more classic pieces of literature, to force kiddos to think about situations where morality plays a huge role, to follow characters and see what becomes of them due to the choices that they make, to stretch students' vocabulary in a new way (as Shakespeare contributed so many new words and expressions of his own invention to the English language), to prepare kiddos for later readings of Shakespeare's actual plays, and to develop an appreciation (or at least a familiarity) of Shakespeare's style of writing.
So, while there will be families that may choose to skip Shakespeare, as we definitely provide that option, there are also many families that choose to use this option. This link will provide more information on that subject:
http://www.heartofdakota.com/rtr_hearts ... hakespeare
I have been pleasantly surprised by my own oldest 3 sons' reactions to Shakespeare's plays in this manner. My boys have actually enjoyed the tales and have been stretched in the ways I listed above as they read. The coloring has actually been enjoyed by all my boys thus far, and I have two boys who are NOT colorers! Yet, they have found it soothing, relaxing, and interesting to color the pictures in the Shakespeare Notebook. The pictures turn out very well no matter what colors are used, and the notebook is a lovely extension and reminder of what was read. My boys actually turn the pages in their notebook throughout the year to remember the tales (and admire the pictures).
On a sidenote, it is surprising to me that we have many families who order just the Shakespeare study from us, even if they happen to be doing an entirely different curriculum. The feedback we typically receive from families who have done the study is that they are surprised by how much their kiddos have enjoyed reading the tales and completing the notebook. This usually surprises parents, as most parents can remember truly disliking Shakespeare from their own high school days!
So, I would encourage you to consider doing the Shakespeare study this coming year. It only occurs once weekly, yet there are many goals wrapped within those once weekly sessions. My oldest son had done all of Nesbit's Shakespeare stories, and had listened to all of Lamb's Tales as well, through our years of Ambleside, but doing the reading of the tales himself provided a different view of them which he did enjoy.
Blessings,
Carrie