Bought the 5-day Paris Pass on line. Was easy, quick, and they mailed the Passes in a week. Once we were in Paris, it made our life easy and affordable...could go to any museum, didn't have to wait in line, and paid for itself in 3 days. Also used for a bus tour and to travel on the trains and buses - all free with the pass.
Only negative was the boat tour, which was difficult to find and not well known among concierge at our hotel.
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