Get the fast ferry across from BA in the morning, it's a 10 minute stroll to town and then another 5 down to the old district - nice to walk around on a fine day - old cobbles, ruins, lighthouse etc - some excellent photo ops with the vintage cars on the streets - particularly the one full of plants. Have a vino, have a coffee - take USD with you. There are ATMs but we couldn't get USD out with our Australian cards. Argentinian peso devalue 50% on the ferry trip to Colonia, so don't waste them here.
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