Hello. Looking for some advice for a first-time traveller to Paris.
Our flight leaves out of CDG at 7:30 in the morning on July 15. We're staying in Montmartre close to the Sacre Couer. We'd love to travel down to the Champ de Mars to see the fireworks on the night of the 14th, but it could take a long time to get back to Montmartre after the show is done at midnight or so. I've heard the fireworks can be seen from the Sacre Couer--would that be a better choice than travelling all the way down to Champ de Mars? Is it going to be insane trying to get back to Montmartre at midnight that night? Is it worth it with an early flight the next day? How early should we get there for either one--websites all say "Make sure you arrive early!" but don't say how early...
As a followup question, we know it's a good idea to be 3 hours early for an international flight, but the counter at CDG doesn't even open until 6:00, only 90 minutes before our flight. Would it still be wise to arrive around 5:00 or 5:30 anyway?
For getting there, would a taxi be better at that time of day, or perhaps the buses? I believe we can do a bus from Montmartre to Gare du Nord, and then the RER B to CDG airport, but how are the buses at 4:30 in the morning? Would it be smarter to do a taxi or use our Navigo passes for the transit?
Any thoughts on these would be incredibly helpful for these first time travellers. Thank you!