I don't blame you for splitting up the drive! I'm 29 and I've started to not enjoy the "drive all night after a full day of work to get there at 2am" thing as much anymore. Universal/IoA will be so fun for your son! I'm trying to think what I enjoyed as a kid around Universal...is there a Ripley's Museum? I feel like there's one in Orlando. Other than that there's always Disney mini golfing!