Tulsa Oktoberfest completely transforms the event grounds into a Munich-style Biergarten, packed with food, beer, music, and plenty of traditional games and activities. Oklahoma's Best Halloween Scream Parks & Haunted Attractions From truly terrifying to kid-friendly and everything in between. Oklahoma has some of the biggest, best, and scariest haunted attractions and scream parks in the country. In alphabetical order, here are your top 10 most terrifying Oklahoma scream parks and haunted attractions you'll want to check out this Halloween. But what do Okies survive on when Fall finally comes sweeping down the plains?