Actually, I just found the email from
DCL:
“We are truly excited that you will be joining us aboard the January 14, 2019,
Disney Dream sailing. As a Guest already scheduled on this cruise, we want you to know about the Disney
Castaway Cay Challenge, a
runDisney event taking place as part of Walt Disney World® Marathon Weekend events.
For the fifth year, the popular
Castaway Cay 5K island run will become a challenge event for participants registered in any eligible race during the Walt Disney World Marathon Weekend. Participants on your sailing who complete the
Castaway Cay 5K Challenge and a Marathon Weekend race event will earn the
Castaway Cay 5K finishers medallion and the Disney
Castaway Cay Challenge medal, in addition to their Marathon Weekend medals. Participants must register through the
runDisney.com website and complete both events within the pacing requirements. Registered participants in this challenge event will pick up their race packets at the
runDisney Health and Fitness Expo at ESPN Wide World of Sports Complex during the marathon weekend.
Guests on your sailing, who would like to run in the
Castaway Cay 5K but have not registered for any Walt Disney World Marathon Weekend events, may still participate in the
Castaway Cay 5K to receive the finishers' medallion only.
While the 5K course spans our island paradise and promises lots of sun and sand, on this particular day the race will also feature some magical Disney surprises along the way. Please visit
http://www.rundisney.com/disneyworld-marathon/ to learn more about this exciting challenge event.
Thank you again for sailing with us. We look forward to seeing you in January.
Sincerely,
The Cast and Crew
Disney Cruise Line”
It sounds to me like there is one race, and all can participate?