Everybody staying at Excalibur, Luxor
and Mandalay Bay
get the coupon book at check in.
Most of the coupons are actually just discounts off purchase, very few actual freebies in there.
You'll see coupons like:
25% off the Luxor
clothing store or the one at Mandalay Bay
$10 off each of the shows (Cris Angel, Carrot Top, Fantasy, Tournament of Kings, Thunder from Down Under, etc)
$5 off Titanic, Bodies or the Spongebob attractions or magic motion rides, etc
Free admission to LAX and/or Cathouse
$15-20 off purchases of $100 or more at the different steakhouses
A couple of 2-for-1 drinks, snacks, or free jello shot with purchase
There will be a few more available than just the above, but that should give you an idea of what kind of coupons are there.