Flower Power/Scenario Guide

Strategy 1, by Figmeister
This one is a fun one. Basically you want to keep all of the cars as they will boost your park rating and start building! You should delete a few cars and make some flat rides, but block off the rest of the paths, make some stalls, and get to work on some coasters, because time is literally money here. Get rid of the path around the park, and the marquees if you need money. Also get rid of the stage. The objective will be challenging if you aren't experienced and just starting. Since you only have until year 2, you must run lots of advertisements and build lots of cool roller coasters. If you are experienced, this will be very fun. Just build everything without making the park to complex.

Srategy 2, by John-Mahmud Edit
You should attempt to keep most (if not all) of the cars in the car park for reasons stated above, but feel free to take a few of them off to build one or two flat rides to keep your guests occupied without wandering aimlessly looking for rides.

Build a Shuttle Loop for a quick buck, make sure it doesn't crash, obviously, and put a maw-length train as well as a photo section for an added buck per dispatch.

Also build some shops there to keep your guests fed and catered.

Cut the path going to the back of the park, and delete some marquees if you need some fast cash.

Build a big coaster with lots of capacity (a giga, a twister or a corkscrew might do the job), and make it roll through the stage for quick excitement. make sure it can roll several long trains, and use block brakes for safety. Place the station either near the car park, or behind the trees, towards the stage. If you do so, then keep the space going from the park entrance towards your station -behind the circular path- empty : You will be able to build a bus tram line there for fast transit between the park entrance & the station.

From that point onward, build rides as will, but avoid opening the whole path around the marquees and also avoid using the space towards the scene for stuff other than your big coaster. You should hit the objectives without any problem if you followed this strategy.