These are 2 stunts that I have been doing just for fun for a little while. Try it.
Stunt #4 is just a few steps south of The Four Dragons Casino (LV)
Stunt #5 is west of the baseball arena (LV)
Check the attachment for instructions
I forgot to put the "legend" in Stunt #4, so I will write that here for those who might be confused.
Yellow: Stance
Blue: Air from high speed up against small hill
Brown: Hit bump
Purple: Hit chimney to get thrown back again
This stunt looks like a loop if you do this correctly :]