Fantasy Island isn't all that great if you're just looking for coasters (and if you've been there a lot previously). It's still cool; BUT, they just got rid of their best ride (which was a stupid move) so they're putting in a Zamperla Spinning Wild Mouse.
Needless to say though, your trip sounds fun!
I just made some plans today!!
This summer, I'm staying at Cedar Point for a week (or a little less) once in July and August. I'm taking a few friends.
Also, I'm taking one of my more-brave friends to Marine Land. But NOT for the animals lol. There's a 450(?) foot drop tower, and there's some rides there, and one coaster that, from what I've heard, is pretty cool.