Hi Natalie,
My # 1 recommendation for kid's their ages is always MK - lots to see & do. * Meet some of their favorite characters including Mickey in Toontown * Buzz Lightyear's Space Ranger Spin * Fantasyland is full of rides they'll love - I suggest heading to Dumbo 1st b/c the lines get long quick & there are no Fast Passes available * The WDW railroad, Magic Carpets of Aladdin, Jungle Cruise & Country Bear Jamboree are also big hits * When you're ready for a little break, climb aboard the Tomorrowland Transit Authority for a relaxing ride * There are great character dining locations including the Crystal Palace (advanced reservations are strongly recommended & can be made beginning 180 days prior to your trip by calling 407-WDW-DINE) * When they are ready to stretch their legs, head over to Toontown & checkout Donald's Boat & Toon Park * The Move it! Shake It! Celebrate It! Street Party is super fun! You get to dance w/ the characters in the street * Don't forget the parades (the nighttime parade is different than the afternoon parade) & fireworks.
If your DSs still take naps (I'm guessing at least the 1 yo does), consider going back to your resort at some point of the day for them to refresh & then go back for more. I'd recommend at least 2 days at MK - 3 if you're only doing 1/2 days. Be sure to visit the
Traveling with Little Ones section on the Disney Website. You'll find lots of helpful tips there including a list of attractions height requirements contained in a PDF file on the right side of that page.
I'm out of room - If you'd like some tips for Epcot, DHS, DAK & surviving WDW w/ young kids, let me know. I'm happy to give you some ideas for those as well. Wishing you many magical memories :-) Allison