I've got a three day trip to Porto coming up in mid-June, and am just now getting familiarized with the city.
In regard to travel, I gather everything is streamlined on the Andante card, and that for tourists there is the option of buying a 24-hour pass for 5 euros or a 72-hour one for 11, both of which offer unlimited travel in all zones for their time period. But then there's also an Andante Gold, which also costs 5 euros, and also seems to offer unlimited travel. To purchase the Gold, one has to provide a passport photo, and when using it can only travel freely within Z1 and another zone of one's choice.
Do I understand the difference between Gold and and the 72-hour Tour correctly? Or is there anything else that's different? And if not, is there any real reason for me to buy a 72-hour Tour instead of a Gold? I haven't planned any destinations yet, but is it reasonable to expect that I will travel outside Z1 so often as a tourist as to warrant paying 6 euros extra for the Tour card?
Thanks in advance for any advice!