I discovered and tested a glitch that allows you to skip all the jungle part of the map, right before the ending. I called this glitch Mushroom Ramp Jump. Ask here if you want the instructions.
I'm too lazy to wait so here's how to do it:
1] Join "Time Trails" on the map "Cheep Cheep Beach"
2] Go to this spot here:
3] Use your mushroom.
4] You will fly like this:
5] Do it until until you reach the wall (do not jump too far).
5.2] The problem is that there is an invisible wall that does that was made to not let you to get to the other side. The invisible wall is small so you will reach the other side easily, but we want to go on the wall so if you train alot you will get the position of the wall.
6] Drive slowly upside the wall (on the right) until you reach the other side.
7] Don't go down until you reach the track.
8] Thank me (optional)
It was originally supposed to slide on the wall and reach the other side with a total of 2 mushrooms. I will change it right now.
does the lap count? also, can it be done quickly enough that it might be faster than driving around?