Hi, Jenny!
You have the perfect plans in mind for your little ones. Well done!
Because you'll be staying at the ultra-convenient (and uber-gorgeous) Bay Lake Tower at Disney's Contemporary Resort, travel to or from Magic Kingdom is a breeze. Thus, a trip back to your room for a nap, bath, pool time, etc., is the perfect way to help both them and you recharge your batteries before heading out for dinner in a park that night.
If you haven't yet made
Advanced Dining Reservations for those two nights, you should do so as soon as possible. Many of the most popular locations book up very quickly, especially because Guests staying at a Walt Disney World resort can make their reservations up to 180 days in advance of check-in (PLUS, they get to make their reservations for the length of their stay, up to 10 days at that 180 day mark.)
Should you need suggestions on where to dine, please send me another question, Jenny. Even if your first choice location is already booked, there are sure to be plenty of wonderful options at this point. There is still time to plan!