To answer the question regarding if you can get everything in at CP in one day:
The problem with only one day at Cedar Point is just how crowded the park can get in the middle of the day... even when its considered "dead" for CP standards. The ride ops at CP are amazing and the park is pretty high capacity, but due to the park's popularity and its limited operating season, no matter when you go, you might be facing hour lines for the coasters easily visible from the front of the park midday, and Steel Vengeance will always have a line for the foreseeable future (unless you're incredibly lucky or an immaculate planner).
In light of this, I recommend going to CP multiple days, and to maximize the beginning of the day, and the end of the day... you can go back to your hotel in the middle of the day or hang out on the beach in the middle of the day if you want. More days gives you more ropedrops, and more evening/night rides. As I was saying before, unless you're an immaculate planner or incredibly lucky, the only way to ride SteVen without a long line is making rope drop. So you want to get your ride in on SteVen for rope drop once a day. Then you can get walk-ons on Maverick and MF. And, you'll want to get Raptor, Valravn, and Wingkeeper in outside of midday.
Just my two cents. Also, most of the flat rides and non-coaster rides are pretty generic and what you see at any amusement park. If you're in a time crunch you probably don't need to ride them if you have a home park that you go to regularly or you go to a lot of parks. Ride those those generic flat rides at parks where your time isn't as valuable.