Having trouble finding the bunnies for the rec room? Their locations are as follows, but be sure to talk to the rec room toad with the characters before looking for the bunnies.

Yoshi's bunnies
-outside of the castle right at the end of the bridge
-outside of the castle left of the bridge
-outside of the castle right of the bridge
-outside the castle in the patch of flowers to the right
-outside the castle at the bottom of the drained moat
-outside of the castle around the maze of hedges
-in the hall to lethal lava land

Mario's rabbits
-outside of the castle left of the bridge
-bottom of the drained moat
-room of Jolly Roger bay
-hall to lethal lava land
-hall to lethal lava land (there's 2)
-top of the stairs on the 2'nd floor
-large mirror room on 2nd floor

Luigi's rabbits
-outside the castle near the maze of hedges
-entrance to bob-omb battle field
-courtyard of castle. Jump on the brown ledge then double jump again
-where you drain water from the moat
-out of the doorway on 2nd floor
-room with the Mario painting
-Outside of castle with cannon. You need 150 stars and shoot to the top of the castle holding the final bunny)

Wario rabbits
-outside the castle to the far right
-room to whomp's fortress
-in the basement near toad
-in the courtyard with boos
-Second floor of castle in the entrance to tiny-huge island
-third floor of castle near tick-tock clock
-third floor of the castle in the opposite alcove of rainbow ride