I would base it only on the parks that you have visited. I would say up to 8 things (The reason I say 8 is because for a bunch of these parks, they don't have many flats. Having 8 additional coasters at a lot of these parks would be absurd, but maybe 5 more flats, and 3 coasters is okay), and up to 8 things to remove.
Six Flags St. Louis Add - A B&M Floorless coaster (which could come from SFMM or SFGAdv) because they only have 1 B&M coaster - A Flying Bobs Ride - A Himilaya Ride - Chance / KMG Revolution Ride - Another set of swings because they took the one they had away - either Zierer or the Chance Yo-Yo again (but leave the tilting mechanism alone
Remove - The Wheelie (Reason is because the Wheelie which is really the Orbit at Great America (same ride) is so similar to Excalibur that it doesn't need to be there. -Ninja because it's too rough - Boss for the same reason as above
Six Flags Magic Mountain Add - Again with a bunch of the same flats because to me this park really needs flats. From another Six Flags park a mouse coaster (SFNE maybe!) - A Flying Bobs Ride - Chance / KMG Revolution Ride - Chance Wipeout - 2 Chance Zippers, Tivoli Spin Out, Justice League dark ride
Remove -Revolution (because people say it's painful) - Himilaya but it's called something else (It just looks so old), - Scream in order for another park to get it.
Six Flags Over Georgia Add- Basically, the same stuff I said for Magic Mountain without the mouse coaster plus transfer Joker's Jinx from Six Flags America to here.
Remove - Ninja (painful ride) - Acrophobia (They seem to have too much trouble with that ride)
Six Flags Over Texas Add - B&M Flyer Coaster, A Flying Bobs Ride - Chance / KMG Revolution Ride - Chance Wipeout - 2 Chance Zippers, Zamperla Power Surge, Chance Giant Ferris Wheel
Change - Looney Tunes dark / boat ride to Flintstones dark / boat ride
Remove - formerly Tony Hawk coaster, Chance Trabant (Put a Wipeout instead there!), like Power Dive ride that they got from Six Flags Astroworld
____________________ I didn't mention Six Flags Great America because if I said to rip out certain rides, I would get blasted so I'm not saying anything.
"I've been staring at the world, waiting. All the trouble and all the pain we're facing. Too much light to be livin' in the dark. Why waste time? We only got one life. Together we can be the CHANGE. So go and let your heart burn bright"
All Six Flags Parks Add - New Vekoma Style Trains to EVERY Boomerang and SLC - Timberliners To EVERY Non GCI/Intamin Wooden Coaster - Live Shows - Bigger Cups of Free Cold Water - Concrete instead of Blacktop - Single Rider Lines Remove - Every Pay Ride
SFStL Add - B&M Hyper Coaster - Family Coaster to make up for the Loss of Rockin Roller - Huss Floorless Top Spin Remove - Hannibarrells (Closed for 15 Years Now!!!)
SFGAdv Add - Reopen Old Country/ Allow A New Walkway so Movietown Isn't a Dead End - Major Drop Tower - Interactive Dark Ride - Family Flat in Golden Kingdom/ Movietown to allow Non-Coaster riders to do something there
SFGAm Add - Mack LSM Launch Coaster where Iron Wolf Was - Sally Interactive Dark Ride where Trailblazer Was - Proslide Rocket Coaster - Giant Ferris Wheel where V2 is Remove - V2 - Ragin Cajun
SFAm Add - Pathways So the Park Doesn't Have Dead Ends - 12+ Slides to Hurricane Harbor (Speed Slides, Body Slides, Tube Slides, Etc.) - GCI Trains to Roar - Gerstlaurer Spinning Coaster - 5-6 Flat Rides? Remove - Penguin's Blizzard River
TGE Add - GCI Wooden Twister Coaster - Multi Looping Coaster - 2-3 Modern Spinning Flat Rides - Sally Dark Ride in the Former Nightmare Building?
SFNE Add - Topper Track to Cyclone - Racing Mat Slides to Hurricane Harbor - B&M Flyer Where Mind Eraser Is - Walkway from DC Comics to Kidzopolis so DC isn't a Dead End Remove - Mind Eraser (Worst SLC I've Been On. Read that Correctly)
And Allow the Haters to chime in, in 5, 4, 3, 2, 1...
Take out the shoulder bars on Revolution at Magic Mountain. And add a new station drive system, mag brakes... The naysayers will say it will never ever happen, but I will be happy the day it does.
Take out flash pass. Not good to cut in front of people who can't afford it. Parks are a fun place, where everyone should be equal..
I know - you had to ask
SFOG is in desperate need of some flat rides. Also, mag brakes for Mind Bender.
I love Great America - I'm so glad it's my home park. I always brag how we have the best run park in the chain; and some damn good coasters.