Magic Mountain is a great park, (I should know there, It was my summer job through high school - Living in Valencia does not offer a teen many career opportunites

), but just expect it to be a thrill park and you'll be ok.
MM will never take the place of DL or Even Knott's in my heart, but it is great for a scream. I'm not a daredevil, but not a wuss, so there are things that even I like. Here are the don't miss rides in my book (Although I think Ghostrider @ Knott's far outpasses any ride on the west coast).
--Superman -- Go up -- Go up FAST!!! I'm afraid of heights, so I came off of this ride crying. Never again...Never again. Everyone else loved it though.

(I'll be drinking my water outside ninja waiting for them).
--Batman--Depends on the person. I liked it, but certain people have said that they "blacked out" due to the intensity of the loops. I don't go often...it is for those "Brave Days"
--Riddler's Revenge - Very Smooth stand up coaster - I call it the big green mean machine.
--Goliath -- Did I mention I'm afraid of heights!!! ACK! (The only ride I have ever looked at and felt sick!). I am terrified of this ride.
--Viper--Fun loops, but fairly smooth. If you have young girls in your party, make sure that they take out their earrings, because short stature mixed with earrings = PAIN!
--Revolution -- One loop - A good "starter" ride.
--Jet Stream -- Fun Flume Ride
--Log Ride -- Another Flume Ride.
--Ninja -- A swinging coaster that almost everyone can handle...not very intense, in fact I find it relaxing, although NEVER walk to the top of Samurai Summit - Always take the Transport up.
...Unless you want to ruin your feet for the rest of the day, of course.
These are only a few. Have fun.
~Tina
P.S. - Don't and I repeat DON'T eat the food at Magic Mountain if avoidable. Bring your own water too. Food is way too expensive (The only worthwhile place was Mooseburger Lodge, but that is gone now), as well as problems with Valencia "pests." Look you live in the desert, and you're gonna have some problems with bugs, spiders, rats, etc...You don't want to know what I've seen.
(If you want a safe place and decent food, eat at Laughing Dragon Pizza on Samurai Summit. Never heard of a problem there.)
Little Known Fact: Magic Mountain was the park featured in the opening to the TV show : Step By Step. What you say? Valenica is in the desert, and the park in the credits was by water? That my friend is the magic of Computer Generation.
Toodles