The Mines

After jumping over the first fire pit, bounce off the enemy to grab an Object and Material. Subsequently, at the two spinning wheels, grab the Material from between the two, then a Sticker on the ledge beyond. You'll also find a Sticker Spot. Plant an Angry Skull sticker there to reveal an Object and 2 Stickers. After dropping between the two wheels, look for a Sticker and Object to the right. Once you've blown open the second mine cart hole, check inside the hole for an Object.

Past the draw bridge, you'll find another switch--hold off on pulling it until the basket higher of the two baskets is right above you, as it'll drop a Sticker (which would have otherwise fallen into the pit). After crossing via the first basket, grab the sticker in the corner (next to the lift). After riding the lift, catch a ride in the higher basket to find an Object on the left. You'll also find a Sticker Spot. Plant the Red Explosives sticker there to earn a Sticker, Costume, and Object.

Make sure you only open the basket when it's overhead, otherwise the item will go bye-bye, as seen here.

After riding the lift, hop onto the red background and use the spring-board on the left to launch into a sticker above. Once past the exploding wall section, jump over the wheel to a Material on the right ledge. Once at the part where you ride the trolley, jump near the start for an Object. As you descend the fiery shaft, you'll spot a Material about halfway.

Just after the Race begins, grab some TNT that drops from the ceiling and drag it back to the wall with the "explosive" sticker on it. It will blow it up, revealing a Decoration, Object, Sticker. During the race, grab the Sticker that's accessible after destroying the first barrier. After pressing the switch, creating a ramp, leap into an alcove just above (from the ramp) for a Sticker. After creating the second ramp, push the mine cart with the explosives to the right to blow open a weak portion, revealing two Stickers.

During the second mine cart ride, get ready to jump for a Key (near the middle) and an Object (near the end). When you reach the section with several wheels, grab hold of the first red one and ride it around for an Object. Do the same for the 2nd Green one for another Object.

During the third mine cart ride section, use the swing you grab a hold of to reach an Object hovering above the flame jets to the left. Once the ride's over, climb the ramp behind the checkpoint to find a Sticker Spot. Plant the appropriate sticker there to reveal some goodies.

When you reach the shaft you'll descend with the spinning wheels, grab hold of the first green one and ride it around into a Material. Do the same for the second Red Wheel for a Key and Audio Object.