Just curious why you want to know this? Are you trying to avoid the onshore ship traffic (which can be considerable), or join in with the thongs of people who invade SXM? As rule of thumb, the most popular days that cruise ships make port in Philipsburg is Wednesdays, Thursdays, and Saturdays. Sundays and Mondays usually have the fewest ships in port. Just kind of a rough guide here. Do keep in mind that some of these cruise ships are modest in size and may carry anywhere from 800 to 1,000 passengers, while some giants from lines like MSC and Royal Caribbean have ships that can carry up to 6,000 people. So, you might want to check that out.