There are several companies that offer the exact same Douro River Cruises and you can easily confuse one for the other as you walk along the Ribeirinha. Beware of "Douro Acima". They are very strict as to when you can actually take the boat tour of the 6 bridges. If you buy a ticket, stay there at the kiosk to board immediately. Even if you have half hour, do not walk away. They will not let you board another boat even though they leave every 30 mins. and will not refund. They were emphatic and quite rude about it.
On the other hand, 50 yards down the river, other companies will allow you to buy a ticket and board at any time and were pleasant to speak with.
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