Go slow, no need to jump around park hopping, small children easily get overwhelmed with sounds, different schedules, time zone changes, different beds. The first time we went with three small children we stayed at the poly and only went to MK for three days. It was enough. Small children love the things we adults wouldn't normally think of as priorities like swimming, coloring at restaurants or in the world showcase, playing on the playground or in the sand. To them that's the vacation! I recommend comfortable strollers, blankeys, buying them each a special stuffed animal to cuddle with, an organized diaper bag and lots of hugs and kisses. Parades like the MK one daily at 2 p.m. are great for small children as they can sit in their stroller and watch it go by. All the best and be proud of yourself you are doing a great job already.