The Office de Tourisme is the place to go if you want to know anything about the town or what is going on there. They speak multiple languages, and have information about places, events, getting around, and can usually help out even if your questions are a little more obscure.
Their main office is on the main road near the geographic centre of Canet, and is an easy walk from the port, the Place Mediterranée, or the old village, however if you are there out of the main season you would be advised to check the opening hours before going there as they might not be open quite when you expect.
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