On virtually the entire track, you can use mushrooms to zoom across the grass. However, some of these shortcuts are better than others.
At the final turn to the first turn, you can use power items to skip across large portions of the track.
If you use a mini turbo at the S turn, you can boost to the ramp.
Strategies
If you're in a frontrunning position on this track, good luck. This track is one of the best bagging tracks in the game due to its offroad shortcuts.
If you choose to bag(good choice), don't try and get ahead immediately. The first two laps are basically irrelevant due to the large shortcuts from power items. Instead, stay back(at a reasonable distance), gather items, and wait until the end of the second lap to strike.
Make sure that you save a power item for the final shortcut. A lot of racers use it to get ahead, so don't get overtaken by not having a mushroom.