Don't let the name fool you. Sequoia and Kings Canyon are one national park--one large park with lots of wonderful trails and amazing trees. Of course, don't miss the Sherman Tree in the Sequoia part of the park or the Sherman tree in the Kings Canyon part of the park. Many trails are easy. Do the loops to enjoy the perspective of the trees. If possible, go with a ranger to learn more about the history and botany. Lots to explore here.
Kids will learn and love doing the Jr. Ranger activities for which they can earn a badge.