We made out first trip to Paris and DLP in May of this year... 9 nights plus a travel day on each end - so 11 days...
Looking at your schedule, you are going to be spending most of your time moving from one destination to another... for us those are travel days not a sightseeing day - as well anything and everything can happen... delays, strikes, you miss your train, or connections run late or not at all...
We had a rough time just getting to France, Air France was on strike and it effected our flight time... it was crazy, we booked with delta, and air France is their partner... On our flight day it was not suppose to be a strike day, and it ended up that changed so we had 24 hours notice that our trip was canceled... I spent hours on the phone... fast forward - So we were awake almost 20+ hours when we landed... Once the room was available, we slept for almost 5 hours...
While we were in Paris there was a train strike, so no metro or trains going anywhere.. So if the trains are on strike what's your plan? to get to where you are going? you need to have a back up plan... Which includes hotel you will need somewhere to sleep... We met a couple at our hotel, that got stranded on a day trip out off the city, the trains were running that morning, and when the tour was over, the trains had stopped, and the group could not get back into Paris that night...
All of this is just part of traveling, once you leave the US... things are very different... you need to be able to roll with it, and have a plan in the back of your head in place for the what if...
DLP - is beautiful - the same and different... We were there 3 nights, arriving around 1:00... we hit the parks right away... and we saw everything that we wanted to see in both parks and the night time show was really great, we saw it 2 of the 3 nights...
Paris is the most amazing city... We fell completely in love with her... The city of lights... We spent 6 nights we went from early in the morning most days, to very late at night, and did not even scratch the surface of this city...There is so much to see, do and experience... Just sitting in a cafe' having caf'e ( coffee) or a glass of du vin ( wine)and watching Paris go by is wonderful and should totally be experienced... Walking the streets, there is so much history you can just walk by... unbelievable...and priceless...
We are planning our second trip to Paris and France right now, this trip will be just Paris and more day trips/tours...
Suggestion for you - make sure you can handle your own luggage... Learn to speak some french, the farther you get away from Paris and the major cities the more you will need it...
Expect the unexpected and roll with it... be prepared for everything...
You are a guest in someone else home ( country)... and you should use your best manners when touring... spend some time learning about the culture, manners, and how things are done, and what is expected.