If You've Been to Yellowstone

Of course you have to see Old Faithful. And there are many places to just walk and see the pools of hot water. Such beautiful deep blue colors. And mineral deposits that look like snow. You should be online researching all the cool stuff to see. There is a petrified tree there. I remember seeing it. Its an interesting place to go. Find some website about it and tell your son about it and he will be looking forward to going more. We took our son when he was 2. He didnt care about much other than the chipmunks he fed at Old Faithful. We had a great time seeing the sights.

Grand Teton National Park. The two parks are practically touching. I've been a couple of times and have always stayed in Grand Teton and then took day trips to Yellowstone.

Also, all the hot springs and geysers. Old Faithful isn't nearly as amazing as some of the others ones in the park.

What you don't want to see is 4 deer run out infront of you while driving 70mph. Ya we loved everything about that trip except for hitting one of those deer in a rental car on the way out of the park.