Updates on several questions:
You need to show your ID when you check-in to the resort. Most CPs are not allowed to work the final day of the program and you have to turn in your ID on your last day of work (which is typically the second to last day). The latest you should book your reservation is the third day before the end of your program.
To use the 50% off dining coupon you still need your Cast ID - I was asked for it at Coronado and Germany.
The Cruise discount kicks in after 90 days of employment.
You get the booklet in October... it is mailed to you so make sure your mailing address is up to date. Several packets went to CPs home addresses.
There are blackout dates for several of the coupons, most are not good for the two week holiday rush in December (over Christmas). Some also expire at the end of the year opposed to going through Oct. 31st of the next year. Therefore, if your CP ends on Jan 2 like many did this year, you'd have to use everything a week before Christmas.