My tips that worked for DS3:
1. Backpack leash (only works for the smaller guys).
2. Saftey tats with cell phone #-ours say, "I have non-verbal Autism."
3. Bright colored shoes, like orange or red crocs-can always see his feet in a crowd of tall adults.
4. Buffets
5. In KY autism is considered a disability. We were able to get a temp handicap parking pass for DS3-it helped with the transitions-leaving park, monorail, walking, tram (we were able to cut out the tram ride, DS3 suffered zero meltdowns when leaving the parks).
6. Small toys for waiting in line-parachute men were a big hit.
7. For the water babies-the padded play area outside of Test Track that the kids can play on/in and it shoots up water. DS3 did great here, stayed for about 30 mins and did really well with leaving it. Have an extra change of clothes and a towel-they will get wet.
8. DS3 seemed to do better with attractions that were outside-particularly loved Goofy's Barnstormer.
9.
You tube videos of the resort and rides/attractions, character interactions.
10. The
Disneyland Sing A Long video-good for MK-even though it is DL and not WDW. We watched this at least 2-3 times a week before bed, sang the songs and talked about the rides and characters.
That's all I can think of for now.