For our family vacation, we made a rule : No Social Media at the parks. We used the phones for the Disney apps, camera and just in case we got separated. other than that it stayed in on our person and that was it.
For my list:
1. Coins for the penny machines
2. autograph books
3. kid Band-Aids/ adult Band-aids
4. sunglasses
5. Ponchos
6. we went in February, so sweatshirts
7. lollypops, glow sticks, bubbles. (truth be told, never used them, they stayed in the bag)
8. wet wipes, baby wipes and HAND SANITIZER
9. TUMS

10. LRC dice game for when we went to restaurants. Kept the kids engaged and preoccupied