Bob-omb Battlefield is a wide open battlefield with a floating island and a mountain.  There are plenty of enemies, a chain chomp and 140 coins.

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Whomp's Fortress is a fortress with towers, platforms, meadows that extend around the base.  There are 195 coins.

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Jolly Roger Bay is a sea level with a ship, columns, an underwater cave, a jet stream and an eel.

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Cool, cool Mountain is an icy mountain with an ice slide, cottages, a ski lift and a body less snowman.

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Big Boo's Haunt is a haunted mansion with ghosts and a scary man-eating piano!  And 150 coins.

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Hazy, maze cave is a labyrinth of caves.

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Lethal lava land is a land full of lava with 205 coins, a volcano and a rolling log.

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Shifting sand Land is a desert with a huge pyramid and an oasis.

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Dire, dire docks is a dock with a submarine, a whirlpool and very little money.

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Snowman's Land is an open snow land with a huge snowman.

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Wet-dry world is a flooded town with a changing water level.

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Tall, tall mountain is a huge non-icy mountain with a secret slide!

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Tiny-huge island is a massive place in which you can change your character's size.

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Tick tock Clock is a huge clock which is either moving or stopped.

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Rainbow Ride is a floating world with many coins, a maze, triangles, obstacle course, a mansion and a flying ship.

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This may sound like pointless information but acts as proof when someone don't believe how crazy the Mario 64 worlds are!

Note:

There is a man-eating piano, the Mad piano and it can be scary.  Some people are petrified after just seeing that piano!