This video covers the fifth and final level ("The Kraken!!!") in the Pirates of the Caribbean Premium Level Kit for LittleBIGPlanet. Since it is not too difficult, I get all three Medals in one go. The boss battle in this level is my least favorite out of all of the "official" Media Molecule (Story Mode and DLC) LittleBIGPlanet 1 boss battles, and that's because it feels like the first phase of a sequential boss battle rather than a complete climatic boss battle in its own right.
This boss battle is significantly easier to Ace if you avoid fully destroying the intermittently attacking ships. For each ship, destroy the two cannons, but leave the last weakpoint untouched. That will prevent the ship from respawning AND you will avoid attack since the cannons are crippled.