We are heading to Paris in mid September. Rick Steves suggests buying a Museum Pass for Paris once you are actually in Paris. I'm trying to reserve a time slot for the Louvre in advance of our trip, but I need the serial number from the Museum pass to do so. So, what to do? Buy the Museum Pass online from home, or reserve the Louvre once we get to Paris and buy the pass? I'm worried the Louvre will fill up, as it looks like the Eiffel Tower already has.
Thanks for any help,