In FUNGAL FREEWAY(while in TRACK ATTACK/EXPLORATION) you can go up to the stone wall. There will be to little ramps leading to the wall. Both are on either side of a door. Go up both ramps and when you hit the wall stop, this will push in two large bricks. Go to the door in the middle of the two ramps and run into it, this will make it open and you'll be in the bonus area.

Play any track in time attack mode. When it asks you to enter your name, type in CAM. When it asks you OK, hold L1,L2,R1,and R2. Then press X. Now exit the track and press L1. You now have three different camera angles