Have you started thinking about Halloween yet? Because Scary Farm has started at Knott's with their haunted mazes.
This year, they've added a secret room to each maze that you can unlock with a "skeleton key". With this you go in from a separate line in small groups (up to 6) for a short interactive experience. You can buy this as a combo with the Fright Pass (like a fast pass but only for the mazes), or book a dinner "boo-fet" that lets you into the park earlier.
Personally, though, if you have to choose where to splurge, I would opt for "Trapped", where the whole maze is interactive. The Trapped maze is $60 for up to 6 people (so if you can get a group of 6 together that's only $10 per person). I was lucky enough to be invited into this maze last year and it was quite fun (i.e. scary). You may have to do some scary things, though, like getting into a coffin ... the eating crickets part was easy.
Some of the new mazes this year is raven-filled Forevermore.