Here is where you can find the pdf: http://www.cinemark.com/images/smc2011/SMC2011_216.jpg You pick a day, either Wednesday or Thursday for the whole summer.
If you don't get the pass, you can go to any of the movies for $1 apiece.
Tip: If you get the kids snack pack, ask for the soda to be on the outside so there is more room for popcorn on the inside.
Personally, I am debating about getting it this year since I past on most of the movies when they came out the first time in the theater. We did it last year and had fun.