Mt. Rainier, Washington

Arches NP, & Grand Teton NP

AMISTAD NATIONAL PARK IN DEL RIO , TEXAS

Wow....that's a tough one! It really depends on what you're after. If you want to see wildlife, go to Yellowstone / Grand Teton. If you want to see beautiful rugged mountains, lakes, glaciers and waterfalls do Glacier. If you want amazing color and interesting geolical formations I'd go for Arches and Canyonlands. They're practically "across the street" from one another. If you want more seclusion and less tourists, but still want to explore the desert / canyon regions then Capitol Reef is nice. Zion and Bryce are both beautiful as well, but you'll encounter more people here than in Capitol Reef. Mt Rainier is beautiful but is really a summer park. We've tried to hit in May and the roads were still closed. July would be the best time to see it. Again....tourist city! Pass on the Petrified Forest in Arizona. It was really quite dull. One nice thing about many of the US National Parks is that you can do more than one in the same trip because of the proximity. You can do Yellowstone and Grand Teton. You can do Zion and Bryce. You can do Cascades and Mt Rainier. You can do Arches and Canyonlands. We've hit as many as 8 in an 8 day trip.

Depending on what you like, I'd agree with fellow responders on Yellowstone and Glacier National Parks. Yellowstone is home to over half of the world's 1000 geysers, including the famous Old Faithful geyser. It also boasts as one of the best parks for wildlife viewing. The Bison will often let you walk right up to them (be careful!). On the other hand, if you want a remote and spectacular hike, I'd recommend trekking up to Glacier National. See the glaciers before they melt away forever. I'm also a fan of all of the mountain sheep that wander the trails along hikers. You can't lose!

I suggest Capitol Reef National Park as a place with a lot of interesting slot canyons you can explore and a vast landscape. Upper Muley Twist Canyon is fun for the arches. You'll have to take a 4 wheel and then walk.

Yosemite NP, Joshua Tree NP, Death Walley NP, Sequoia NP - California NP

Olympic in WA, Arches in Utah and Glacier.

Boonoo Boonoo National Park in NSW, Australia

Jasper. Amazing place, speechless. And it's a 4 seasons destination.

Yosemite. Hike for a few miles and you will have he park to yourself.

Cape Lookout National Seashore.

I love Glacier and Big Bend. Also love Olympic in Washington and of course Yellowstone (off the main routes).

Call me a homer, but I gotta go with Yosemite. Half Dome, El Capitan, Yosemite Falls, Bridalveil Falls, Glacier Point, the Merced River...it's freakin incredible!!

khao yai in thailand - butterflys and waterfalls.....

Rocky Mountain National Park. Though it is, of course, more of a Summer park since the roads that go to the higher peaks are closed when it gets too cold and snowy. But gorgeous scenery, and not many people actually hike in, so if you want to pop on your day pack, you can have some near- or actual solitude.

Zion is very special. Yellowstone and Yosemite are great but often very crowded. Glacier and Crater Lake are usually pretty serene getaways. The Grand Canyon is a must-see at least once.

Since you posted in "North America" I will ahve to say Yellowstone. Pure nature and ruggedness. can't wait to visit in the winter one day.

Banff in the Rocky Mountains. Gorgeous turquoise lake and the snowy glacier in the background makes for wonderful pictures!

In the U.S....I second Brenda S. re: Zion. It is so incredibly beautiful! I also like Arches and Crater Lake as well.

Zion and Bryce Canyon National Parks in Utah

Glacier Bay is absolutely amazing!

Antelope Canyon!! no dude!

Swiss National Park in Engadin, Grisons. And some of the nice nature reserves in New Zealand

If you want to see only nature - Frontenac National Park near the thousand Islands in Canada!A very nice and quiet place!

I have visited the Canyon de Chelly. It's little but beautifull ! It was 14 years ago. But I can remember every feet I made in this amerindian's land. Bryce Canyon is althought very nice!

Mt. Rainier is my fave, but I would also recommend parks in the Adirondaks as well

Crator Lake National Park in Oregon. It was unbelievably beautiful...

Last Sunday, I visited the Masoasa Hall at Zurich Zoo. It's been declared a national park! It's a complete build-up of a Madagascar rainforest in the middle of Zurich, inside a gigantic glasshouse. Phantastic.

Yellowstone is the best i've seen, but its not for everyobdy.

Tongariro, Newzealand.

I havent seen all, but for me it is the Bryce Canyon in the morning and Arches National Park in the evening :)