Work comes first
You join the ship as an employee, not a passenger. Your duty schedule, training, emergency responsibilities and department standards shape the day. Some periods are extremely busy, especially embarkation, turnaround, formal events, peak service and sea days for guest facing departments.
There can also be quieter moments. A port call may create time ashore for some crew, while another department is busiest precisely because the ship is in port. The experience depends on the work you were hired to do.