We just returned from a trip to Nice, Marseille, Avignon and Paris, and I have a few updates to the guidebooks.
In Nice, Rick's online updates say that the Nice museums may start to charge admission fees in 2015, and I can confirm that that is true. It was 10 euro for both the Contemporary Art Museum and the Matisse Museum. However, if you plan to visit more than 2 museums (not counting Chagall), you can purchase a 7-day pass for 20 euro.
Also in Nice, the updates mention that the Russian Orthodox Cathedral is closed for renovation this year--it doesn't mention that this renovation includes the exterior as well. All of those beautiful onion domes were covered in scaffolding--couldn't see a thing. They did have an icon on display, but that may have been in anticipation of Easter week.
In Marseilles, we were having a hard time finding a place to stay, and finally decided to look at the Ibis hotel at the train station, which Rick mentions is about 100 euro, but can often have deals on line. Booking about 8 weeks in advance, we paid only about 52 euro! We usually stay in small local hotels or apartments, but I have to say, getting off the train and being able to drop our bags right at the hotel was really convenient.
In Paris, Rick warns you that the line for the catacombs can be about an hour and a half, and that you can minimize that by getting there by 9:30 (opens at 10). We arrived about 9:40, and didn't enter the catacombs til about 12:15. If I had known that it would take that long, I would not have spent my time that way.
Finally, Versailles. I know there is a long thread about Versailles, but I wanted to share my experience. We visited on Easter Sunday--it was the only day we could go. Even the website said don't come this weekend. We arrived and saw, I'm guessing, about 3-4,000 people in line. We followed Rick's alternative plan, visiting the gardens first. It was a Spectacle Day (when the fountains run some of the time) and there was a separate admission, not covered by the Museum Pass. We stood in a short line about 11:15. We loved it. There were people, but most were in the line for the Chateau. We also walked right into the Grand Trianon. By the time we reached the Petit Trianon, Chateau crowds had moved in, and we chose not to see it. After a lunch in the gardens, and another view of the fountains when they turned back on, we left about 4:30 PM. By then, only about 100-200 people were in line at the Chateau, so we were able to see that, too. Seeing the gardens first worked great for us!