Answer: Holland America's Mariner Society Rewards Program provides valuable benefits to our guests based on cruise days, onboard purchases, and "double days" for guests who purchase a suite. The collective days earned based on these three criteria are known as "Cruise Day credits." All guests are automatically enrolled in the program after their first completed cruise. There are five levels — Star Mariner, Two-Star Mariner, Three-Star Mariner, Four-Star Mariner and Five-Star Mariner — each with a unique set of benefits.