My packing list-
-clothing: two oufits per, person per day, swimsuits, pj's, sandals for the pool, swimsuit cover-up, two comfortable pairs of walking shoes, sun hats, sunglasses, watches for you and DH.
-toiletries, medications and first aid- I bring everything and on various trips have needed different things. Moleskin is a must- look where they sell Dr. Scholls products, sunscreen, bug spray.
-extras: nightlight for bathroom, bright colored bandana to tie on stroller, squeeze breeze, camera, film, chargers, cell phones and chargers, humidifier or some other contraption to block out noise in the room (trust me on this one),masking tape and sharpie marker -every day I write our cellphone number on a piece of tape and stick it on my son's shirt-just in case, scissors(you always need these for something), a sewing kit or safety pins, shout wipes, ear plugs, your Ps numbers and confirmation sheet and I know I am forgetting some things! My son gets ear infections, so alcohol and droppers!
cooler- water bottles, juice, milk (parmalat), snacks
fanny packs! DH and I each carry one and split up the contents between us-
don't bring a bunch of stuff from your wallet that you don't need-
we take- driver's license , insurance cards, credit cards, AAA or travel club, cash, PASSES, room key, rain ponchos (dollar store ones should be fine to take at first), camera, autograph book and pen, wipes, dental gum (we are fanatical), PS numbers, a small ziploc with first aid items (what good does it do to have tylenol in you room and have to buy some in in the park for a headache?)
For kids your age, you will need a double stroller or two strollers.
I suggest arriving at the parks 30-40 miutes before opening (even on Early Entry days). Hit all of your must- see attractions first. I would take your kids on all the rides you can without assuming they will be scared. My son had a BLAST on Thunder Mountain when he was three. He also loves Splash Mountain. If you are just very casual about it and are having fun, they will too.
My suggestions for the parks-
MK- everything here is great for little ones, EXCEPT:
Snow white
Alien Encounter
Space Moutain- I don't like it because you ride one behind the other.
I would start in fantasyland with dumbo and Pooh and go from there.
Epcot- My son loves:
Spaceship Earth
Living Seas
Food Rocks, Circle of Life
Honey I shrunk the audience
Journey Into your Imagination
Ice Station cool
The world showcase is so much fun- stop at the kidscot stations and let them color
AK-
everything BUT Dinosaur-some attractions have height restrictons, so prepare the kids for that.
MGM- A lot of shows here, but a really fun park. My son loves Star Tour and Playhouse disney. The Muppet 3d is good, too. Take time here to notice all the small details.
We always arrive early and take a pool/nap break at our hotel. Then head out in the late afternoon/early evening. The most hot and crowded time of the day is between 1 and 4pm. Don't be surprised if all of you nap every day! It is very exhausting! I would plan a down day in between for just hanging out.
Eating early is a good idea , too. Eating an early breakfast, an early lunch (11 or 11:30), and an early dinner (5 or 5:30) insures you a nice quiet meal. We rarely have had to wait in line for food and we have our pick of seating. We try to have one sit-down meal per day. Make sure you have your PS's in place, although we've never had troube making PS's once we arrive.
Get those Mickey wake up calls. I try to make it for when I know my son will already be up, so he can answer.
Have fun!