I agree with @RDAOU, there are many ways to skin a cat in Revit. It depends on the complexity which you're after. I think the general consensus is your timeframe, which is now pretty much down to 1 day 
I'm not sure how familiar you are with SketchUp, or Revit for that matter. If someone came to me right now, telling me that I need to have a "Theme Park/Roller Coaster" concept done by tomorrow, then I would do the following:
Download SketchUp (if you don't have it already). Then download a Rollercoaster Model/s, then export the SketchUp Model (.skp). There are hundreds of Rollercoaster Models available in SketchUp's 3D Warehouse to choose from. (You could just do everything in SketchUp, but I'm assuming that you need to submit the project as a Revit Project, if so, continue below).
Then I'll import the SketchUp Rollercoaster Model (Basis of the project) into Revit and then add other elements. (Site Elements, People, Ablution Blocks, Buildings etc. etc.) - Get creative, even other SketchUp Models like Theme Park Rides can be imported...
If you haven't imported a SketchUp model into Revit before, then have a look at THIS POST.
I hope this helps! 
Rudi Roux
MSc | Digital Engineering Manager
LinkedIn
Revit Mechanical & Electrical Systems 2018 Certified Professional | Revit MEP & Architecture 2015 Certified Professional
AutoCAD 2015 Certified Professional | Autodesk Building Performance Analysis (BPA) Certificate
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