I've completed this level. Collected the 4 coins & the 13 bonus.
But I can't seem to find a way to the white button inside the walls, or on to the island haunted by the ghost. I don't see any reason to go to the island, but behind the white gate a special feature message might be hiding under a box.
I keep playing this level over and over, trying different moves, but I'd like to know if I'm wasting my time. Please let me know. I don't need a blue print on how to get there, just let me know if I should keep working the level.