There are Cat Shines usually hidden behind the blocks with Bowser's face on it. In order to break these bricks, you'll need to wait until the island turns to night and the dark storm (Bowser's Fury) arrives. Lure Bowser so that he faces the blocks you'd like to destroy. If possible, find a platform to hide behind, face Bowser and he'll fury blast fire and destroy the bricks behind you.