Well what we did was, got an ADR for breakfast at Hollywood and vine.. I'm not a breakfast person, but I liked it a alot. The kids get to meet Disney junior characters. THen waited till dinner and ate at ABC Commasary or Backlot express.
As you said you have to feel out the kids. One day of SWW might be enough, or they might be begging for more.
I forgot to mention, Hollywood studios also meet and greet with movie actors or voice actors for some of movies/ cartoons. For example they had James Arnold Taylor, Ashley Eckstein, Ray Park, Warwick Davis, and more..
But they only way you can get to meet them is if you come early early and line up at HS gates. once they let you in you get to stand in a line for a wrist band for meet that person. Kinda cool! But I couldnt get up that early, plus the kids dont care that much.... yet.. hehe