15 Stars to break the Bowser statue and unlock this level.
Stamp: Activate the glowing pink blocks and start making your way up the course. When you see two glowing platforms against a cliff near a bunch of Galoombas, activate the further platform and then fall into the hole it creates. Now, simply activate the pink blocks and grab the Stamp.
Star 1: Keep moving further into the course and activate the various blocks to create steps back and forth up the cliff face. A Green Star is on the very left side of this cliff area. Get on the platform below it and then wall jump to reach it.