More than 90 people have been reported ill on board a Royal Caribbean ship sailing out of Tampa, Florida, according to the Centers for Disease Control. An outbreak of an unknown illness with primary symptoms of diarrhea,

Royal Caribbean’s Western Caribbean Cruise promised vacationers the chance to hike Mayan ruins in Mexico and swim in the waters of Grand Cayman.

An outbreak of an unknown illness with primary symptoms of diarrhea, vomiting has stricken 89 of 2,164 passengers as well as 2 of 910 crew on board the Radiance of the Seas, according to a report on the CDC’s Vessel Sanitation Program website.