Pre-book your attraction tickets online
This piece of advice isn’t unique to Paris, but it’s very important. Save yourself time and hassle – book your tickets to attractions online. The most popular sites like the Arc De Triomphe and the Eiffel Tower always have queues.
The 1st time I visited the Eiffel Tower with my wife, I waited in line for 1 hour to get a ticket. I watched like a lemon as the people with tickets walked right by. The 2nd time I went with my wife, I watched the lemons wait for tickets as we walked straight by. It was rather satisfying!