My DD is only 6, and she really enjoys Knotts. There is a large "Camp Snoopy", which is a large kids area, with rides like the Red Baron, Snoopy jumper, what I refer to as Frog Hopper, etc. While they are "rides", they aren't "e-ticket rides", as I would think of them. DD and DH did Camp Snoopy for about an hour and a half when we were there in June and I took DS's to go on some of the rollar coaster type rides.
Rides that the whole family went on include the river rapids, the stage coach, the train, the zipper, merry go round, the "hat ride" (think tea cups with sombreros) and bumper cars.
We also had run wandering around the shops in the ghost town area, as there were some really unique ones. DD especially likes the glass blower, and DS's liked the carved animal area.
We ate at Mrs. Knott's for dinner, and if you like really good chicken dinners, wow, this is the place to go. VERY good food. And a ton of it! I should have split a chicken dinner with someone, but didn't. Even the kids meals had a lot of food.
We've done Knotts for next to nothing on more than one occasion, making it very worthwhile. There are tickets in the Entertainment book for those who have one for anywhere in So.Cal. Also, local grocery stores tend to have discount tickets available. I don't know the age of your DS, but I also like that the kid's age limit goes to 11, not 9, so my second DS is still child rate. We enjoyed ourselves when we went, but it was pretty quiet (except the toys for tots, I'll never do that again!)
We must be lucky, as we've never seen alot of the problems that others have. The place was clean and the staff helpful, the food was pretty good, too. I do think you see more PDA and more unaccompanied teens/preteens, and that can be a bit of a pain, but I also think that they don't tend to gravitate towards areas geared towards the younger kids/families, as it wouldn't be so cool. However, in the lines for the bigger faster rides, expect PDA's and swearing and clothing and attitudes of all sorts.