What about a random roller coaster generator. You say (using sliders) how many loops, twists, how high and how long you want your rollercoaster to be and then it automatically generates a random coaster.

Hmm, what about HD graphics???

I really miss the ability to customize weather and background in the sandbox mode.
And also the ability to transform a Sandbox into a scenario...
And the option to turn off the creation of trees off-map. Not only in the graphics section => show trees... A desert with trees isn't a desert!
More backgrounds... An Island should be surrounded by sea not by an ocean of palm trees! NO?

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Oh and a select all (ctr+a maybe?) in the select inventions list... 'Cos now it takes aaaaaaaaaages....
And that the queue lines lose the fencing as well when you choose no fence.

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One more thing: an option when building raised paths that would turn on/off automatic fences.
And maybe (not necessary) one more angle for paths...
For all I care peeps can come with climbing gear ready..

BETTER FPS AND SPEED! my game is fine until one second it goes from 70fps to 1fps!

And also the ability to transform a Sandbox into a scenario...

You can do that you know.....

Not to mention the fact that Soaked! was missing a lot of features that are in real water slides.

The game need to be able to do things more automatically, and do it well.
A smart support system with the ability to move supports around and connect to other supports realistically without the just disappearing. That should be done automatically.
Have a feature where you could have the terrain meet the height of a tracked ride in any section of your choosing.
More realistic stations maybe with different themes, and is covered.
The coaster should match the ability and have all of the elements real coasters have (trim brakes on inclines, LIM lauchers, etc.).
When doing a launcher the speed that needs to be reach and the length of the launcher determines how quickly the acceleration is.
A flat ride engineering mode.
As many flat rides and coasters from both the past and the present that can be crammed in the game. (Full sized carousels with brass ring option is a good example.)
Certain rides with options to be covered or uncovered. (Like The Whip)
Certain scenery items that float on water. (Fountains, water fire, etc.)
When you select a coaster element like a loop, corkscrew, or a curve, you have the option to re-size, change angles, and banking.
I could write a book on this. I will stop now.

Those are all excellent suggestions Atomic.

I'd like to add: the ability to save portions of ride tracks or save complete rides as structures so we can simply assemble them in the park and join them all into one ride. Right now, if one places three different track sections into their park, even if they're joined exactly they are still read by the RCT3 game engine as three separate incomplete rides.

Other changes I would like: a park a minimum of 1,000x1,000 tiles and a game engine that can handle all the CS I can put in the park. I would also like to have (all at the same time) hundreds of stalls and coasters in the park, dozens of enclosures containing hundreds of animals, the ability to have 50,000 guests & 10,000 staff in the park, with reflective water, with day and night cycle, with shadows in the day cycle, with the highest LOD/geometry imposter settings set permanently that way and all with my existing system and without the game crashing once for any reason.

Yes, the parks need to be bigger.

I think it should have REAL parks with it.