You're going to have a fantastic time!!!!!
If you only plan to do a water park one day, then just buy a day pass, it's cheaper that way.
Check out menus on allearsnet.com and figure out some TS meals you want to eat and make adrs asap.Our familly enjoyjed TS lunches-great break/rest from the crowds/park.
You're there 9 days, you'll be able to see almost everything you want to see-especially all the rides at MK.
You don't have to do everyday at RD, but definently plan several days at RD. YOu'll be shocked by how many rides you can do before the lines start building. my dh is totally not a morning person at all and he whined and complained about getting up early but he was so glad he did!!!
Make a super early breakfast ADR at MK, that way you can get into the park before it opens and get a picture in front of the castle with no one else in it.
Don't underestimate transportation time, especially if you're taking a mid-day break. You ahve to walk to the bus stop, wait for the bus (up to 20min), ride the bus, walk to the entrance of the park. Do it again to return to your resort. And then do it all again to go back to a park at night. It's a lot of time!
Mid-day breaks weren't great for us, but my kids are smaller. Ifound it was just too much wasted time traveling. Our most successful days were when we got to the park at RD and stayed until about 3 or 4, went back to resort to enjoy the pool and then had dinner and bedtime at normal time for them. Of course, you miss stuff that way. But at least there are tons of things we wnat to see on our next trip that we missed.
HAVE FUN!!!!!!