Sinister scares are everywhere at SeaWorld Howl-O-Scream, recently named the #1 Best Theme Park Halloween Event by USA TODAY’s 10Best Readers’ Choice Awards. SeaWorld Howl-O-Scream was voted to the top by theme park enthusiasts and fans of fear across the country. Howl-O-Scream events in Orlando, San Antonio and San Diego boast menacing scare zones, terrifying haunted houses, signature shows and more horrifying fun throughout the three SeaWorld parks.