Another voice of experience saying that you should make ADRs for (1) every restaurant you want to definitely eat at and (2) for any meal that you really want to eat at a specific time. We make ADRs for every meal at any restaurant that takes ADRs.
The only thing to be aware of for Sci-Fi is that, depending on the age of your kids and their sensitivity to movie images, you might want to reconsider. The cheesy old black and white sci-fi films they show TOTALLY freaked out my son when he was 6 -- our meal there was the worst experience of the trip for him and he refused to even consider going back there until our last trip (when he was 11). As an 11-year-old, he could see through the bad special effects enough to appreciate the humor, but at 6 it terrified him.