Grand Teton National ParkLocation: Northwestern Wyoming
Known for: Jagged mountain peaks and diverse wildlife.
Biggest crowds: July and August
Accessibility: Much of the park can be viewed from roadside overlooks.
Why kids like it: They can see wild animals and experience the mountains on foot, on horseback, or from a boat.
What hikers say: Grand Teton has trails for every skill level, from simple strolls around mountain lakes to steep treks.
Best for:
Yellowstone National ParkLocation: Northwestern Wyoming (and parts of Idaho and Montana)
Known for: Extreme and consistent seismic activity, resulting in the world's most extraordinary geysers and hot springs.
Biggest crowds: Mid-July through mid-August
Accessibility: Driving in and around Yellowstone will take you past snow-capped peaks and creek-carved canyons.
Why kids like it: Visiting Old Faithful, the most famous active geyser, is awesome!
What hikers say: Enjoy day hiking through over 2.2 million acres of wilderness on over 1,100 miles of trails.
Best for:Visit the Travel Talk forums for help on planning your trip