MB,
Great question as you well understand: morale is critical to survival.
My answer is: BIBLE. My secondary answer would be a deck of Playing Cards with knot tying information on them. My wife and I could play cards (or you can play solitaire type games) and entertain/distract yourself by practicing different knots (which is a valuable survival skill).
Here are the knot tying playing cards that I have:
http://www.ebay.com/itm/Survival-Playing...=item2eb6f3a296