Port Exit Fee at Puerto Quetzal?

[Killington]

The tour operator that I am possibly going to use for a trip to the Mayan ruins at Iximche tells me we have to pay a port exit fee. This started out at $25pp then when I queried it morphed into $5 port exit, $10 to the ruins (in addition to the $7 entry fee originally quoted, and $10 to the curtural centre. This last is an option, with alternative being Antigua, for the afternoon after the ruins. I have told them we want to do Antigua, waiting for reply.

 

Can anyone who has had a port call at Puerto Quetzal tell me anything about this port exit fee? Did you pay it? Who to? Can you pay in $$ or must it be local currency?