I went to SFWoA when I was in the Cleveland area and I loved it. I would definately take the third day there. Although others here call it a gimmick, I think X-Flight alone is worth the trip. It was one of my favorites after I rode it the first time.
IF the coasters are good??? I doubt you'll say they are just good after you step off of X-Flight and Dominator! their awsome. and X-Flight a gimmick? it's a flying coaster. nothing more nothing less, it's not trying to be anything more than it is, which is a simply awsome experience, and the only flyer out this way. not to mention Dominator is the only floorless out this way as well. as well as the longest, and with one of the worlds tallest vertical loops at 142 feet in height. Well worth it. you wont be disappointed.
Go to both parks. Its not that long of a drive to Gl from cp. maybe an 1hr - hr and a half. Took me 45 mins. But that was going 90 mph on the turnpike. I'll be at cp may 6th-12th I plan on going to both parks.