We will be at WDW for 2 weeks in mid-December (19 days to go!!), just 3 of us: me, my wife, and 11y.o. son. I have a conference for 4 of the days. We are not "big" or "picky" eaters, but would like to experience the show of the Sci-fi and 50s Prime Time restaurants. How far in advance is it necessary to make ADRs for these, lunch or dinner? We are not very organized and often make last minute decisions based on mood, weather, and so on, as to which park to visit and where to eat. Thanks for your help.