Wow,, so many little tips, many of them learned here. You don't have to get a Musuem pass to avoid long lines in many places, there are alternate entrances and online tickets and a bunch of other tricks.
Having a pen and paper easy to get to is handy if you want to write down a number or have a shop keeper do so,, I know french numbers up to a hundred or so , but when they speak quickly I can get confused.
Ignore ignore ignore,, I knew this one from relatives, but I really think its something that every first time visitor should learn to do when confronted by strangers wanting to "chat" have you sign a clip board, or give you a ring.. lol.People from big cities usually know this, but people from smaller cities and towns may feel they are being rude. They are not, they are being smart .
Hotel rooms with shower only usually have the type of shower I am used to, the mounted one in a stall,, ones with tub and shower often have a hand held shower and no shower curtain, so you have to sit in tub and "shower" or get room soaking. I try to reserve shower only rooms.
French people are not cold or rude, but, they are not bubbly "hi I'm Jeff your waiter for tonight " types either,, they are warm and wonderful with family and close friends, but there is a reserve that is cultural and does not mean they hate you,, just like you are not crazy cause you smile at passerbys( they think its weird there) ,, they are not mean cause they don't. Showing respect is important there, always greet( bonjour madame or monsieur) shopkeeper or clerk before asking for anything,, they are not your servants and feel very much to be at same standing as you,, the revolution meant something to them,, lol so just walking up and demanding something is a no no.. ( hey they will likely give it to you, but there will be an air about it ),, and metro kiosk workers can actually just ignore you ( I have seen them close a window on a rude demanding tourist once,, he just kept yelling at them louder and louder in english,, thinking that would help,, lol )
Try the stinky cheeses( being from Netherlands you probaly know this one) , they are often the tastiest.
Pops and juices are expensive in restos.. get house wine and tap water.
Its worth the metro trip out to St Denis, I guess I should be happy its not a crowded place like Notre Dame, but its so worth seeing if you have any interest in French history.. I loved my day there.
You can't just sit on the grass anywhere in Luxembourg gardens,, there are signs everywhere , but I just thought this was weird,, so plan to picnic on a bench,, there is sitting grass, but on hot days its crowded.