Ghosts and goblins by the score come aboard Disney Cruise Lines for one of the best Halloween parties at sea. Halloween On The High Seas is a fun-filled frightful cruise the whole family will scream for joy about. The ship is adorned in eerie decor while spooky, not-so-scary parties and activities happen throughout the duration of the cruise. Disney goes all out for their Halloween Celebration which is why everyone is dying to set sail on a Halloween On The High Seas cruise.  Before you book here are some helpful tips and what to expect during your Halloween On The High Seas Cruise. When Does Disney Cruise Lines Offer Halloween…