This can include anything. Disneyland, WDW, Magic Mountain, Knotts, Universal, Six Flags Parks, Sea World, etc. Any theme/amusement park you can think of. What ride is your favourite of all-time? In other words, which ride do you enjoy the most?
Just pick one in and outside of a Disney park. As much as I love the thrill aspect of things with rollercoasters I always appreciate the theming more. Don't get me wrong, I am a rollercoaster enthusiast and make no apologies for it. But if you go to a roller coaster at Cedar Point for example it is thrilling, but you never think to yourself that you are anywhere but a roller coaster. The themed rides that tell a story and transport you into another dimension. So here it goes:
Disney: Pirates of the Caribbean (Disneyland) - Best ride I have ever been on, and the ride I would pick to go on again and again. You can't beat it, it has everything and it is classic Disney all the way. Love it, and will take it over any rollercoaster.
Outside of Disney: E.T. (Universal Orlando) - Very Disneyesque and dare I say, magical. Takes you back to the days of when you first fell in love with this movie. Themed perfectly, couldn't be better in my opinion. You actually feel like you are part of the movie, and the ending with E.T., well I won't spoil it, but what a nice touch.
So there you go, even the thrills of Cedar Point can't top these classics.