Hi Heidi. I think the issue is that there are very few boats sailing up and down the river and apart expensive occasional trips nothing for tourists. I travelled on what what really a cargo boat with space for a few passengers. That came into the old port in the bay which closed long ago. You might want to try asking around down there if any bits of it are still open, or possibly the naval HQ across the road from the port.

Worthy of anyones list. I am hoping that once travel gets going again people will come and see all that Paraguay has to offer

Thanks. Pleased you enjoyed it