One thing to do in preperation is get an envelope or similar item to keep ideas and papers in that you will take with you. Start now, because when the crazy time just before you leave comes you will be glad you kept all the things you have gathered.
Meals: There are a number of places that serve meals that are definitely large enough to share. My favorite
is the fried chicken dinner at the Plaza at the end of main street. You get 4 pieces of fried chicken, mashed potatoes & gravy, green beans and biscuit for $12.99. You could get 2 of these and select other sides for the whole family. You can go in and take a look at the food before you buy since you choose what you want and put it on a tray. Another favorite of mine is the corndogs at the cart between the photo store and Plaza Inn or over in CA Adventure down by the Jumping Jellyfish. They are hand dipped right there and cooked fresh and very yummy. Another place to go check out the food before you purchase it is Rancho del Zocalo in Frontierland next to the Shooting Gallery. Again the meals are large enough to share. In both places I think the food is very good. One other thing to share is the giant turkey legs. You get them at a small place behind the Matterhorn on your way to Small World. Yummy!
Don't forget to buy a bucket of popcorn to share and have as a great keepsake. Churros are large enough to share as well
Rides: When you first enter the park if you go to the City Hall they will have information for you having a wheelchair in your party. Be sure to tell them you are there on a wish trip - it never hurts to see if you can get something special since this is a special trip. Nearly all the rides are now made to accomodate handicaps and you rarely have to wait in line long.
California Adventure: Be sure to go see the shows, esp. Aladdin. There is also the Brother Bear show over in the Redwood Creek Challenge Trail, across from Grizzly River Run. There is a sidewalk show over infront of the Animation building and be sure to go in to see Turtle Talk with Crush inside that building. Be sure to have good seats for the Block Party Bash (ask a cast member for advice. They know where the floats stop.)
Cast Members: Be sure to stop and talk to cast members as often as you can. They know better than anyone what is going on and tips to make your time more enjoyable. I have learned the best places to sit during parades, how to get the attention of those in the parades, best times to go to rides, best places to eat,...
Have Fun! If you have a digital camera, give the kids a scavenger hunt type thing to do. How many hidden Mickeys
can you find (esp. if the 50th hidden Mickeys are still up) , or pictures/sculptures for their favorite character; or something silly like finding all the bathrooms and taking pictures of the entrances
When you are waiting in line, talk to the people around you and keep track of all the places they are from (keep a very small spiral to write their first names and location and what ride, maybe even ask to take a pic with them for the scrapbook. Have your kids predict how many state/countries they will get each day or how many repeats they will get.
Once a cast member told me to always be sure to look up
when walking around the park. There are some wonderful things above you that never get noticed - part of the Disney magic.
I know Fantasmic has a great seating area for groups with wheelchairs - take advantage of that. Ask a cast member if there are areas for the parades, too. I know I said it before - TALK TO THE CAST MEMBERS
Have a wonderful time!