Huzaifa,
I am always glad to help!
So with two little girls, here is what I would do;
- June 16 - Arrival day (see below)
- June 17 - Magic Kingdom (all day)
- June 18 - Epcot (AM) / Hollywood Studios (PM)
- June 19 - Hollywood Studios (AM) / Magic Kingdom (PM)
- June 20 - Animal Kingdom (AM) / Hollywood Studios (PM)
- June 21 - Magic Kingdom (AM) / Epcot (PM)
- June 22 - Departure Day (see below)
OK, for you arrival day you could go into the Magic Kingdom, but with a later arrival in the day, you might prefer to save the ticket money and simply enjoy your resort. Get in some pool time, schedule a really fun opening night dinner (Chef Mickey's in the Contemporary, 'Ohana in the Polynesian, or Whispering Canyon Cafe in the Wilderness Lodge; All three nearby or in your resort!).
For your departure day you probably don't have time for a park, so I would take a relaxing morning, get a nice breakfast in (any of the last three suggestions would be good here too!), and maybe visit the pool one last time.
I am glad to help with any follow-up questions!
Have a magical vacation!