Sundays are more crowded ... multiple cruise ships unloading/loading for the week, more local families in town, etc. More people could be a good or bad thing, depending on your personal preferences.
Weekdays, you have rush-hour issues that you'll need to work around (6am-8:30am and 4pm-7pm). Avoid that and you'll be fine.
On Sundays there are guided tours at the forts that aren't offered on Monday. Here's a link to the calendar:
On Mondays they offer tours of the governor's mansion, La Forteleza (sp?). You can't do that on Sunday!
On Sundays there are crafters and other artisans on the plaza near the cruise ship dock with most setting up starting in the late afternoon or early evening, I think.
On Sundays families will be on the lawn near Ft San Cristobal flying kites. Such a magnificent sight!
So, maybe you should go on Sunday unless you're dying to see the governor's mansion.
Thank you for the replies
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