Basically any National Park you choose to hike with your kids will be amazing. You just really can't go wrong where National Parks are concerned. This being said, there are some parks that are more suited to hiking with the kiddos than others. Here are the 10 Best National Parks in America to hike in with kids, in our opinion.
Joshua Tree National Park
Olympic National Park
Congaree National Park
Death Valley National Park
Everglades National Park
Yellowstone National Park
Big Bend National Park
Acadia National Park
Redwood National Park
Shenandoah National Park
Like I said, any National Park is great for hiking, but these are some of our favorite hikes and ones that are great for kids. We love our National Parks and can't wait to visit more of them. The link below is to the original article, which has more information including a great kid friendly hike in each park. 
https://statebystate.net/10-best-national-parks-to-hike-with-kids/