I certainly do believe in mythical creatures. Vampires don't glow in the sunlight, though. That's a myth that needs to be busted right here and right now. Sorry I had to be so blunt about it, guys. But facts are facts.
I believe in the mythological and the paranormal. Like Patchisou mentioned Vampires glowing in the sunlight is real BS. One mythological creature I believe the most in is witches though.
I don't believe in much. Mythical creatures and the supernatural is one thing that, while entertaining in fiction, I have no belief whatsoever in when it comes to the real world.