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I also love to spend a day in Paris!
It's easy to make your way to Montparnasse from CdG on RER B and then a Metro line.
I stayed at Enjoy Hostel which was about 10-15 minutes from Gare Montparnasse.
Checked myself in, then oriented myself how to...
I've done it a couple of times.
Very easy.
Great excuse for a day in Paris to get over jet lag.
The Airport Bus takes you to Gare Montparnasse
Montparnasse station to Bayonne on the fast train (TGV 4 hours).
Bayonne to St Jean (connecting train)...
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