What Is The Movie Called?

I watched this movie a few years ago and I can't remember the name. It was about these two girls and their father who one night have to escape on a ship because some bad mythological creatures are after them or something. They meet medusa and a minotaur. The father creates some glasses for medusa so they can look at her and the two end up falling in love. When the ship is attacked medusa takes off her glasses to turn the enemy to stone but accidentally looks at the minotaur (who is a good guy). At some point they meet a unicorn and feed it silver apples and an ogre thinks they're princesses. At the end a dragon skull turns into a real dragon and kills the bad guys.