I live near two amusement parks, both of them Six Flags (one was regular, the other was water-themed). So naturally.
Probably been visited those parks about... 20+ over the course of my life? And the number is higher for high adrenaline rides.
This is currently the "highest and fastest" ride of Six Flag over Texas,
the Titan. 85 mph (roughly 137 km/h) at max, with the main drop being 255+ ft (~78 m) high. I remember one time I went with a friend, and we rode that ride for 3-4 times straight. I couldn't feel my stomach for nearly 5 minutes after that.
[video=youtube;OPS25WItiZ0]http://www.youtube.com/watch?v=OPS25WItiZ0[/video]
There's also the
Texas Giant, which I believe is the steepest
wooden-based roller coaster in existence. Don't worry, nobody's died from this wooden roller coaster (but it wasn't smooth before its reconstruction). Either way, this is an old-fashioned favorite.
[video=youtube;Jaq6gcZVXnI]http://www.youtube.com/watch?v=Jaq6gcZVXnI[/video]
Also, Six Flags over Texas has a huge DC Comics section dedicated to the park. One of the best and most unique rides I've ever rode in my life is one of those DC rides,
Mr. Freeze. One of the reason why is because of the ride's interesting track that has a point of interest during the ride.
[video=youtube;W09oDrMUkx8]http://www.youtube.com/watch?v=W09oDrMUkx8[/video]
It can accelerate from 0 to 70mph (0 to 113km/h) in roughly 3-4 seconds
without needing vertical potential energy.
Keep in mind, I have a vast fear of heights (I can't look down from high heights without getting very light-headed), yet I love these kinds of roller coasters, especially the ones I mentioned.