Thrill-Ride Track

The Thrill-Ride Track is a treasure in. It is actually a piece of a toy train track.

Below-Grade Discotheque
There is a Thrill-Ride Track sitting atop a large valve-like object on the far east side of sublevel 1 of the Below-Grade Discotheque. To collect this treasure, you must throw 7 Pikmin on it.

Doppelgänger's Den
There is a Thrill-Ride Track inside of the Gildemander in the center of sublevel 4 of the Doppelgänger's Den. To collect this treasure, you must first defeat the Gildemander, then throw 7 Pikmin at it.