They act like buses, stopping at various stationary stages. Except big blue, which has only one way entrances and a one way exit.

Mute City, 5 stops

HRstadium - start
 Yoshi's Story - wide with many plats
 Dream Land - tunnel
 Great Bay - healing area
 Onett - pendulum

Corneria, 3 stops
 Flat Zone - ship
 Yoshi 64
 MK1 
 Hyrule temple 

Rainbow Cruise, 3 stops
 Yoshi Pipes - highest right plats
 Flat Zone - ship cabin
 Peachs Castle- back of ship
 Yoshi64 - highest leftside plats

Venom - 2 stops
 Jungle Japes
 Depths
 Fourside - one way via ufo

Big blue
 Mk2 - one way into bb
 Peaches castle - one way into bb
 Great bay - one way out of bb