My husband and I are about to take our first trip to Paris in a few weeks. We currently live in the Netherlands and are fairly frequent travelers. I've been doing all my "homework" by researching and reading various posts here and in on other forums, but there are some things that can fall through the cracks. Plus I'm just plain curious and I find TA forumites to be some of the most generous and interesting folks around.
My question is this: for those of you who have already experienced Paris, what did you discover you wished someone had told you before your first trip? Did someone give you advice that you found particularly helpful or useful that you'd be willing to pass on? Anything from communicating, how to deal with scammers, public transport, public toilets, supermarket etiquette, restaurant behaviour, cultural "quirks" particular to Paris, how to generally not annoy the locals and be a good visitor etc. etc. etc.
My thanks to anyone who shares their thoughts on any of the above.