The Big Shot at the Stratosphere in Las Vegas, definitely!
I used to think roller coasters (the wooden ones) were scary! My parents rented a house in Hull, MA during the late 1970's; I was probably 12 or 13 year old at the time. There was an awesome amusement park there that had a huge wooden roller coaster (probably not safe at all). Scary as it was, we went on it too many times to count!!!