For Magic Mountain, I’ve actually done the park in one day a few times, and if you get a Flashpass (Minimum Gold) that should be sufficient.
Gold Flashpass tends to be pretty good anyway.
If you are hiring a car, then be at the park for opening (Typically 10am, but ideally you want to be at the gate 9:30 so you can be in the front crowd when the turnstiles open, and get into one of the major rides without a queue) then do your scenic drive after.
(Or maybe forego a bit of a sleep in for one day and do some driving in the hills in the cool of the morning...... just so long as you get to the park for opening, I cannot stress this enough)
In terms of the non coaster attractions, the only ones to worry about would be:
>Justice League (If it is completed in time for your visit...it’s completely different to the one at MW, and has a motion base vehicle)
>Lex Luthor Drop of Doom. Granted its only a few meters taller than giant drop, but it has single rider, so you won’t waste any time.
Nothing else is noteworthy, and the rapids are overly wet. The flume ride is much the same as any other.
For the coasters, there are 15 adult sized ones....If you can ride at a rate of one every 20 mins using flashpass or through lack of crowds, then that means 5 hours.
I think this is a good rough priority order in terms of the must ride ones....The top three should be absolutely done.
1 Twisted Collossus – Racing, heaps of airtime, crazy twists and inversions, and very smooth. One of the world’s best coasters.
2 Tatsu - Flying coaster, but this one works because it is literally on top of the mountain, so the whole ride has you soaring well above the trees. The pretzel loop is an awesome intense finale.
3 X2 – Groundbreaking coaster with seats that can flip, so about 3-4 times in the ride you get turned upside down. The first drop makes the most of it by dropping you down head first.
4 Riddlers Revenge – A big lengthy stand up coaster. Single rider line via exit to get straight on.
5 Batman the Ride – Smooth intense inverted coaster...It’s just a really good package.
6 Goliath – Hypercoaster. The main reason this gets slammed is because its only got one airtime hill, but objectively, it’s still a great ride.
7 Apocalypse – Wooden twister coaster that is nonstop, and runs fairly well.
8 Full Throttle – Interesting, has a couple of launches, a huge loop, and a big hill...it’s fun, but not as fleshed out as the other coasters.
9 Scream – Multi looping coaster with floorless cars. Its good, but the floorless gimmick isn’t as great as you’d think. Do riddlers first.
10 Green Lantern – This is polarising, people either love the intensity and insanity, or find it so intense it is unenjoyable for them. Single rider is on this one via the back stairs, so give it a go.
11 New Revolution – Has Single Rider for non VR riders. If you want to ride VR, expect to wait 90 mins, or fork out for the platinum flash pass.
If you want to see what all the fuss is about with VR, then just wait to ride Arkham at movie world with it.....Otherwise, a lap via single rider non VR is fine, it’s a fun classic coaster.
12 Ninja – Suspended coaster with swinging cars. Its good, but not that extreme.
13 Viper – Looping coaster. It’s not as rough as people say, and is decent, but if you have a choice the other coasters should come first...But it has Single Rider, ask for directions if you can’t find the Singles entrance.
14 Superman: Escape from Krypton – If you have ridden tower of Terror at Dreamworld then this is the same.
15 Gold Rusher – A bleh mine train. If you are riding Big Thunder Mountain at Disney, then this will be a disappointment.
To sum up a game plan I tend to use, basically, be there for the gate opening, then move with purpose straight to either X2 or Full Throttle (I’d say X2) and get a ride in before the hordes, then try and get a 2nd ride on another one nearby (I tend to pick Tatsu), and from there, assess queues, get a flashpass if needed, then work down the list.
Also, if you have only got limited time, have you considered Universal Studios? That park can definitely be done in your timeframes, and is closer.