Thanks guys so much for the feedback. One other question or two actually. Where is a good place to get cheap tickets? Is there a website I could maybe purchase the tickets here in America for cheap? And also if I were to take the rer train. Is it impossible to get there as soon as the park opens? Thanks again in advance.
Try the official Paris Visitor's Bureau. They are cheaper from them than at the park. It looks like they are offering a huge online deal for September (but you need to know the dates you'll be visiting the parks).
http://booking.parisinfo.com/il4-of...utm_campaign=Produit Disney PROMO ETE 2016 uk
You can also buy them in person from them at one of their Welcome Centers (though keep in mind they might not always have the tickets in stock). You can of course buy non-discounted tickets at the park. I did both (my second day was a spur of the moment visit, so I bought it at the park). When I bought my ticket at the park, there was no line.