I love theme parks and roller coasters! I've never been to Cedar Point, but I've a ton of good stuff about it. I hope to go some day! These are some of the ones I've been to:
Disneyland - Anaheim, CA - One of the old greats. Space Mountain and Big Thunder will always be favorites. Special mention to the Rocket Rods, a short lived ride from 1999 or so. It was a high speed ride built on the old raised Peoplemover track. Since the old track didn't have banked turns, it had to slow down on each curve. But it was so fun when it was working! The track to it still stands above Tomorrowland as a remnant curiosity to this day.
Knott's Berry Farm - Buena Park, CA - A park very close to Disneyland, and slightly older. Silver Bullet is an amazing hanging coaster with a smooth ride, one of my favorites of any park.
Six Flags Magic Mountain - Valencia, CA - THE roller coaster park, possibly the best in the country? It has so much to ride, it's crazy. X2 is a bizarre coaster with pods sticking out of the central train. You sit in these pods, and they can spin independently of the train. It's great. Another one, Ninja, is a comparatively simple coaster for modern standards, but still great fun as your hanging car swings through the trees.
Washuzan Highland - Kojima, Japan - I went here as a teen in 2000. It's a park at the top of a hill overlooking the ocean. It was a workday when we went, so almost no one was there. Imagine going to an empty amusement park and riding anything with no wait lines. It was a fun, but rather small park.
Europa Park - Rust, Germany - A fairly large park with some strong "knockoff" Disneyland vibes. They've got a large sphere like Epcot does, a teacup ride, and a cool Pirates of the Caribbean style ride called "Pirates of Batavia", with Asian pirates. There was a really nice Mercedes sponsored roller coaster too.
Heide Park - Soltau, Germany - Sorta like a Six Flags park, but in Germany! A fantastic park that focuses on thrill rides. A lot of coasters were really fun. One called "Flug der Dämonen" (Flight of the Demons) is similar to X2 from Magic Mountain. Oddly though, one of the most pure fun things I saw there was a simple boat ride called "Topilaula Schlacht". You get in a boat that has a row of seats on each side. These seats all have water cannons on them that you can fire. But what do you fire at? Well the twisty river path that the boats travel down is also lined with water cannons, and random park-goers can man these cannons to blast water at the people in the boats! Everyone in the boats will focus fire on whoever is at these cannons. You could stand and watch the water war for an hour and not get tired of it.