We packed small snacks in each fanny pack. DS6 is on the autism spectrum and he likes the security of snacks he is familiar with and I think it calms him to have a small break and a snack. I'd put a combination of granola bar, raisins, juice snacks, fruit roll-up, nuts and change it up a bit each day. Also helped save $$, very rarely asked for snacks which can add up in the parks.
We also got those small plastic key tags (avail. in hardware stores to label keys) and put our name, cell phone number and resort name just in case. Kids knew if they got "lost" to show it to any CM and they would call Daddy.