I don't have first hand knowledge of sailing on the Magic on a Saturday with a shuttle launch the next day, but I'll offer some opinions:
The Captain has to get the ship from Port Canaveral to St Maartin by Tuesday morning. I don't recall exactly how far that is, but I seem to remember reading that it was about 1200 nautical miles.
The ship travels at a cruising speed around 22 knots per hour.
If the Captain were to 'linger' around Port Canaveral to watch the shuttle launch on Sunday, I don't think he could make up the lost distance to arrive by Tuesday morning, as scheduled. There aren't any shortcuts and he can't go much faster than 22 knots.
If the ship cruised at 22 knots for 24 hours, at 5pm on Sunday it would be about the same distance from Port Canaveral as it would be on land to Charlotte, NC or to Atlanta, NC, or to Mobile, Al from the Port.
So I would have to say that I don't believe you'll be able to see anything this time.
Sorry.