Beautiful City Trial and Top Ride. Celestial was awful in Air Ride, but I lucked out with the lap digits checkbox to be able to finish in decent time. A 21 is probably possible with a repeat amazing city, no resets in Top Ride, and a godlike 3 courses in Air Ride such that you don't have to do more than Wagon and Swerve free runs. The perfection you'd need for that is not worth going for lol