i guess you talk about the first of the 3 new scenarios - the one with the working Go-Kart track and the Monte Carlo adapted scenario. imho the best looking map of all career maps so far. i love what the designer(s) have created here.
I've managed all stars this way:
- I've added some cams around the active pathways, and let 4 security guys guard these areas by using the existing rosters - 2 guards walked the path left and right of the kart entry, the other 2 left and right of the exit.
- Added some more seats and bins
- closed unprofitable shops like Street Fox Coffee and Donuts. My visitors dislike them big time, no idea why.
- then I've build the available Luna Auto track ride directly behind and on top of the kart exit - letting the track run around some buildings -> 100% entrance scenario and high track scenario for free

. 16$ and visitors still happy about a cheap ride, lol
- didn't have to wait long to have some good profit out of Luna Autos and I've build the next visitor milking machine - Rolling River. I've used a gap between 2 buildings on the right way (coming from park entrance) to draw my entry queue path. again the existing scenario helped to give a good queue scenario rating without building anything. The Rolling River was quite short : Up the hill on this right side, direction to the houses on that hill, then some extended slightly angled curves (using incremental piece) with torrential water (anyone else wondering why these pieces are cheaper than the quieter ones??) and 2 short drops (final costs around 8000$) back of the line of houses I've talked of. No further ride scenario was added by me when opening it and still visitors had no worries to spent 20$ for the fun.
after opening rolling river i just had to wait for the profit start to roll. you can now complete all open tasks without stress.