As I've visited WDW also some times I get also information posted by the DIS a board about DisneyWorld and DisneyLand. This article posted by them is also applicable on Disney Land Paris.
Some things are no brainers but still good the hear.
Here is the posting from there:
http://www.wdwinfo.com/walt-disney-world/a-guide-to-a-happy-disney-vacation/ (http://www.wdwinfo.com/walt-disney-world/a-guide-to-a-happy-disney-vacation/)