We're leaving tomorrow --great time to ask this question, right? I'm not talking about attractions but other things -- like overpacking, underpacking, too many ADRs, not enough ADRs, going to the parks every day, not going every day, using PhotoPass, not using PhotoPass, etc.

I'm looking for specific things that YOU have learned by experience that you won't bring/do again on your next trip. Again, not looking for advice on attractions but for trip planning.

Thanks in advance!