N.L.
Not sure of your definition of "basic admission" but I'm guessing you went the one park per day route. If so, make sure to plan out parks/activities based on the park (for example, Wishes is at Magic Kingdom, IllumiNations is at Epcot, Fantasmic is at Hollywood studios.
You can get "advanced seating" for Fantasmic by doing the lunch/dinner package at one of 3 restaurants at Hollywood Studios. I think you can also do reserve seating for Illuminations (I know it's on Fastpass+, but not sure about "regular" Fastpass). If the boys are into pirates, there's the Pirate League (pirate makeover) at Magic Kingdom.
If you're going to be at Disney during the Epcot Flower and Garden show, you can also get a Dole Whip at the Pineapple Promenade. We love tasting all the food at the various outdoor kitchens.
Try and get character dining reservations in NOW. It may be too late, but it's still worth looking. Additionally, meals at restaurants in parks require admission to the park itself, so if you don't have park hopper tickets, you'll want to plan accordingly (ex. Crystal Palace - for Winnie the Pooh characters - is in Magic Kingdom whereas Chef Mickey's is at the Contemporary resort). I'm pretty sure Hoop ded doo Revue will be booked, but look into that for a fun dinner show at Fort Wilderness. Or maybe the dinner show at Ohana.
Have fun researching and planning, and enjoy your trip!