'Another Day' will appear at the bottom-left of the screen. This mode changes a couple things in the game, including your starting point and new fare locations. Press the R button at the character selection screen, then press R a second time and hold it down while you choose your cabby.
At the character selection screen, press LEFT TRIGGER, RIGHT TRIGGER, LEFT TRIGGER, RIGHT TRIGGER, LEFT TRIGGER, RIGHT TRIGGER. Then, pick a character to drive a bike instead of a taxi. Alternatively, complete all sixteen Crazy Box levels to unlock the Special Taxi for each character, which is selectable in crazy box, arcade, or original modes. To choosethe bike in crazy box mode, scroll to the right of Gus at the character selection screen. To select the bike in arcade or original mode, press Up at the character selection screen.
You can drive the Rickshaw (or Bike Taxi) instead of a car taxi by entering the following code at the character-select screen: Hold LB, hold RB, release LB, release RB, hold RB, hold LB, release RB, release LB. Then, choose a character.