Cartagena on Sunday?

I understand that some attractions in Colombia are closed on Sundays. If anyone has traveled to Cartagena on a Sunday, can you please tell me what we might expect to find? We are planning to take either a ship tour or a private tour to the old town of Cartagena.

Thank you.

Cheryl

I'll be there on a Monday, and I've been told the gold museum is closed then. :( But since it is open on Sunday, I would say it's a don't miss!

Also, I've read elsewhere that admission is free. :)