A straight away to the finish line (the rides finale) in my mind a no brainer, a la test track.
They could program it such that the winner is random, sometimes left lane, sometimes right lane.
I imagine they launch two carts at a time side by side, leaving space between launches and each pair battle it out through the course at a slower speed then at the final straight away, open it up, and go the fastest at the end for a thril.
In the beginning of the course I don’t imagine the cars going fast, going too fast through the twists and turns would be uncomfortable for the riders. I imagine up until the final straight away it will be no more intense than test track up until they open it up on the outdoor track there.
This will be an outdoor version of test track with a racing theme instead of a testing theme.