What is the best National Park to visit?

I am just wondering what you think is the best National Park to visit because I’m looking to make a trip to one. I have already been to Denali, Glacier (only got to see half of it though, half the park was closed) and Theodore Roosevelt. I would prefer a place that isn’t as crowded as Yellowstone or Yosemite. I like to be able to enjoy the wilderness without a ton of people around. So if you could just give me some input on what park you think is good to visit and what has the most to offer. Thanks

Sequoia & Kings Canyon
http://www.nps.gov/seki/

Bryce Canyon
http://www.nps.gov/brca/
Zion
http://www.nps.gov/zion

Bryce and Zion are close together. You can go to both and travel on one of the most scenic highways in the country. I did the trip a few years ago and will do it again. Bryce is one of the most amazing sights I have ever seen. Ruby’s Inn is right next to the park entrance and is where everyone stays.
http://www.rubysinn.com/

“Utah State Road 12 Scenic Byway, the “All American Road”
State Road 12 is one of southern Utah’s nationally-designated scenic byways and is one of very few routes in the U.S. honored by the Federal Highway Administration as an “All-American Road,” boasting one-of-a-kind features so exceptional that they qualify as a destination “unto themselves.” Visitors can’t beat a route that in being a beautiful journey becomes an extraordinary destination!

State Road 12 starts out near Red Canyon and Bryce Canyon National Park, and passes through Grand Staircase-Escalante National Monument, and Dixie National Forest, ending near Capital Reef National Park. It is a route that is not only scenic, but also that serves as one of the main throughways accessing these area attractions. The 124-mile road winds its way through the Escalante canyons, providing panoramic views over the miles and miles of colorful rock formations. As you drive near the town of Boulder, before Escalante on State Road 12, steep cliffs drop into narrow canyons on both sides of the highway, giving passengers an incredible view out their windows. The route has two entry points. U.S. Highway 89 is the southwest gateway, seven miles south of Panguitch, while from the northeast, State Road 24 in the town of Torrey near Capital Reef National Park provides an entry point.”
http://www.byways.org/explore/byways/2020/
http://en.wikipedia.org/wiki/Utah_State_Route_12

Here is a picture I took:
http://en.wikipedia.org/wiki/File:RedRockUtah.jpg