Bikini Bottom:Go to the back of Spongebob's house, go to the right.

Downtown:In the beginning construction site, go to the right.

Tree Dome:At the bottom of the tree, there is a big root. Go on the
root.

Jellyfish fields:Go to where you get the tile for "On the Prow of
the Ship". There is a strip of land. Go to the left on the land.

Chum World:In Chum Putt, at the middle to the end.

Goo Lagoon:Behind a rock where you go on top of the umbrellas or
another part with umbrellas that move with the Reef Blower.

Dutchman's Graveyard:You're on your own.

The tile puzzles also give you hints.