Grand Canyon National Park
Yosemite National Park 
Rocky Mountain National Park
Zion National Park
Yellowstone National Park 
Olympic National Park
Acadia National Park

All of these places I will try during my day trips from las vegas with kids  and I am sure that this will be really a good and most appealing way of fun for sure. 

wow, you will visit all of these places during your trip. I must say that you should enjoy these activities there when you will explore these places.
Hiking
Camping
Photography
Walking
Natural beauty
Boating

I also explored your shared all these most adorable parks but both of these like Grand Canyon National Park and Yosemite National Park are top of the list of my favourite attractions. I would love to explore both of these parks in my future life again and again. If you are adventure lover then I will suggest you must explore these parks and you will come back with stunning memories.