Year after year they have highly-themed, quality mazes as well as some scare areas around the usual Universal Studios park. The backlot area is particularly scary since it does seem like a free-for-all in the woods, and crazed killers lurk everywhere. Tickets are $59 at the gate. Here's last year's review.
Knott's Scary Farm Haunt in Buena Park
Read my Knott's Haunt review for details. Tickets are $46.00 at the gate. It's an old standby that won't disappoint, and this year had several great mazes.
Night of the Living Dead / Zombie Love at the Maverick Theater in Fullerton
I was lucky enough to attend both this year - Night of the Living Dead gets better every year, and I couldn't recommend it more. Each year they add a little something to the show that makes it different and better than the previous year. But let me say that if Scott Johnson ever stops playing Ben, it won't be the same for me. I now trust him - and only him - with my zombie-killing needs. Read my review for Zombie Love over at Spooky Little Girl's blog. It was also entertaining, though nothing can compare to NOTLD, and I wouldn't recommend it if you don't like musicals. Tickets for both shows are most likely already sold out, but it never hurts to call and ask.
The Olde Towne Music Hall in El Segundo
I went to their showing of Dracula and loved it. The Mighty Wurlitzer is front-and-center in the theater; before the movie we heard everything from traditional, carousel-style organ music to a cover of the Beatles. It's a treat, and a glimpse at a simpler time. Every Halloween weekend they show the original silent Phantom of the Opera, and the organ is played as the score to the movie. Personally, I never need to see anything Phantom ever again, but if I hadn't seen it recently, I'd go just for the live music. It's a cheap evening too - tickets are $8 and concessions are about $2 each.
The Dia de los Muertos event at Hollywood Forever Cemetery
I understand that it gets crazy-busy, so if you can manage the horde, you'll love the altars, the Day of the Dead processional, and beautiful costumes. Tickets are $10, parking is non-existent. It's an L.A. tradition, so maybe the chaos is worth it.
Old Towne Haunt in Pasadena
When I visited, it was great - truly scary. The Old Towne Haunt doesn't have the same quantity of mazes as a theme park haunt, but they make up for it by scaring the crap out of you for the 15-20 minutes that you're there. They find clever ways to breathe new life into their mazes, and the scare-actors are usually pretty dedicated. Tickets are $14, and there's a front-of-line pass for $19.
Zombie Joe's theater in North Hollywood
Currently showing Attack of the Rotting Corpses. I haven't seen this particular show, but I like the small theater, and the I-could-die-here vibe that I got when the doors were closed and the lights went out. There's artwork on display in the lobby, and concessions are cheap. Tickets are $15.
There are also lots of lovingly-crafted home haunts - and there are even probably a few in your neighborhood - but it takes some looking to find them. If you want to stick close to home and you don't want to pay a lot of money, I recommend searching your city's website, and these sites:
Alley Cat Scratch - they meticulously list haunts from Burbank to San Juan Capistrano. I'm sure you can find something on that site that is in your neck of the woods.
HauntedHouse.com - they also have a list of many of the smaller attractions. Use the top navigation if you're not in CA.
If you don't like my suggestions, here are a few reviews from my friend Spooky Little Girl:
Los Angeles Haunted Hayride in Griffith Park; tickets are $25-$60
Reign of Terror in Thousand Oaks; tickets are $13-$20
Or if you just want to stay home and watch a scary/corny movie, don't forget about Elvira on Saturday night, and your Netflix subscription. Netflix Instant has some great movies, with my personal favorites being the old-school monster movies, and the campy classics.
Killer Klowns from Outer Space - a campy tradition. With terrifying clowns.
Dracula A.D. 1972 - a bizarre spin on Dracula that focuses on a group of beatnik kids in England in the 70s.
The Munsters: Season 1 - If you want to make Halloween a light, family affair, you can't go wrong with the Munsters.
Them! - my personal all-time favorite creature feature. It's a classic B-movie that does tend toward hokey-dom, but I think it holds up surprisingly well.