MK - its really hard here for a hidden Gem, BOG is really not a hidden but is a must see I enjoyed dinner there, but I would go for lunch if you can't get dinner. We eat at off times, as we do in our daily life, the Plaza is a nice spot for a burger and milkshake and oh so nice to be able to sit down, and relax. If you are up to leaving MK lots of options at the resorts, Kona at the POLY is a good go to.
Epcot - so many options here, it really depends on what you are in the mood for, Sunshine season is a really great QS, that offers more meal style offerings, Coral Reef is sorta a hidden gem we love sitting and watching the fish swim by, it is so relaxing at the end of a long hot day its a perfect spot. Anywhere in world showcase there are lots of options, maybe do something different and snack around the world case, sharing some items as you go, this way you can taste a little bit of everything. Our new fav TS is spice road tables, really good food and service, but check out the menu for your kiddos.
DHS - SCI-FI it is so fun, my DD could not get over that when I was a kid I really saw movies like that. - Honestly for us there really isn't much in the way of choice's here. Starring rolls does offer good quick breakfast selection.
AK - Tusker House is our favorite breakfast buffet, we have had dinner here and it was the food and service was good, when we went there were no character at dinner I am not sure if this has changed or not.
Disney Springs - lots and lots of options here, you could try the food truck area, some really interesting items, and some kid friendly ones, While not a hidden gem Rainforest and T-Rex around fun with the kiddos. We really enjoy Portobella Country Italian, we have always enjoy our dinner here, and they have a nice selection of wine, and great service.