You can cut about 10 seconds off your lap time by driving into the doors of the Plantation House.

Go to Cliff Diver Track. Near the end of the track there is a tall island with a tree on it. Ride up to the tree and turbo off the island. If your timing is good you'll be able to do between 4 and 8 flips!

Go the left of the house at the beginning of the race and go around the outside of the grass and you can cut off about 45 seconds or 15 seconds a lap.