just as school gets out. This is a crowded time. Go to your favorites the first two days and especially consider being there for the 17th. If you want to do CP at Epcot I would consider the dinner package.
I think if you can afford it I would definitely do
MVMCP. At this time of the year, it's the best to be at MK. Get prepared it will be crowded for the 17th. If you decide to do it make sure you buy your tics ahead because this date usually sells out. The best strategy here is to go to park closing. After 10 pm the park is wonderful.
Ways to help at this time is to have advance ressies for whatever you want to do. Get early starts every day. EE entry can be a good stategy if you go very early to the designated park and then park hop by 11am or so. Use all the park hours available between the parks like going to AK for the day time and park hop to Epcot for the night.
You're going at the most crowded time; so, you need to plan, plan, and plan your stragedy.
Personally, if you are close to the holiday time or right in it I like to stay for at least 10 days for this time of year. Anytime is good at WDW; so, whatever the amount of days you are there just go to your favorite places first.