To get the Last and therefore hardest secret tape in the game boy
Advance game, go to New York, NY and go straight down the road once you
have started.  When you come to a T-junction, go left.  Once
you pass the two small jumps, turn around and jump off the one the lets
you jump to the left(and down).  Wallride and wallie onto a pipe. 
Grind down the pipe to the end, then jump, wallride on the building, and
wallie again onto a large marquee.  Grind on the Sign to the end,
jump, wallride and wallie onto a fire escape.  Grind the escape until
you lose all your speed, then jump for your life and hope you got the
tape.  Believe me, it is hard.