Fall Terrace is a nice resturaunt, price is not kid friendly. You have a gorgeous view of the falls. Near Safeway there is a Bonzi Wok, really good Japanese food. But you have lots of things close - Jack in the Box Taco Time Burger King Panda Express are all within a couple miles
There are a number of restaurants within a couple blocks. Google maps can point those out. I've seen a food truck parked next to the fountain as well.
Traditions cafe is an immediate neighbor of the fountain, and they have snack as well as meal food.
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