The view from Eureka Peak is at least as spectacular as Keys View (and you'll likely be the only person there) but it is only accessible by an unpaved road -- low clearance vehicles probably not recommended but it is otherwise not difficult off-pavement driving.
Again, if you liked Joshua Tree, you'll love the East Mojave Scenic region! Kids who climb Kelso Dunes and slide back down will sleep very well that evening, as but one example. And maybe they'll find the buried wagon full of well-aged whiskey that is allegedly buried beneath the dunes somewhere.