We were just at KBF last week and it was pretty good. (we have AP) September is a great time to go-the weather is usually pretty good and if you go M-F you'll have the park mostly to yourself. I love to go in Sept. (DD8 is offtrack then!)
The park isn't open late during the week (closes at 6, or 5:30 later in the month) but you'll have plenty of time to do all rides (multiple times). The best coasters (IMHO) are Xcelerator, Silver Bullet, Sierra Sidewinder, Jaguar, and Montezumas. I don't like Ghost Rider or Boomerang-I find them too rough! When you go the newest coaster will be open-Pony Express. It's due to open soon. (Emp. told us as early as next week) If you are going after Labor Day, on a weekday, you won't really need a plan. Just ride the rides as you come to them.
Also quite a thrill is La Revolcion and Supreme Scream! As a single rider you might not have to wait at all!
Many times you can stay on the ride and ride it again. Of all their coasters, Xcelerator is the best. 82 mph in like 2 secs. There's usually only a wait for the front seat-try it once-best seat in the house!
Don't skip the tried and true KBF originals-Log Ride, Calico Mine Train, Train, Hat Dance, and Stagecoach.
We too get the chicken when we go, but we get it from the To-Go located right next to Mrs. Knott's. Same chicken, less$$$
Depending on when you go in Sept., the park may already be decorated for the Halloween Haunt. If so, some of the rides will have netting, etc. over the scary parts. Last year, however, we did see alot of the spiders on the Calico Mine Train ride. Also, the stagecoach is closed once they've decorated.
Ditto other posters advice re: discount coupons. KBF is almost always offering them. Send me a PM when your trip gets closer and I'll let you know if I 've heard of any offers. (sometimes my DD's school gives them coupons)
And yes, Knott's is no Disney-but who else is? I enjoy KBF for what it is. And yes, it is frustrating when it seems to take forever for the employees to check you before the ride starts, but you'll still have plenty of time. Oh, and KBF food and beverage prices are pretty high-even higher than DLR.
Have a good time. Maybe we'll see you there-we'll be there several times in September.
(once we return from WDW, that is!
)
That is really helpful, I will print off the info and put it in my Knotts section of the file!
We like to go there after we arrive, if we get an earlier enough flight from CA. 
