Hollywood Studios...toy story, rock n roller coaster, tower of terror, Disney jr characters (can do character breakfast or lunch with them if your young kids like them), frozen sing along, little mermaid for the littles (are they girls?) fantasmic, I can take or leave star tours and great movie ride. Now I would probably get a park hopper and ride boat to Epcot and ride soarin and test track (however you will be looking at a long wait for both by the time to got there-use rider swap if you do go and older kids will be able to ride twice). Maybe eat dinner there and then boat back for fantasmic. Other than that, my family doesn't like Epcot at all. I realize some love it but we think it's extremely boring except those 2 rides. I might even do animal kingdom in the afternoon instead of Epcot if you think you are up for 2 parks. It tends to quiet down a little in the afternoon and there is more fastpass availability there in the afternoon. Or just stick with Hollywood Studios!