Acting as a National Park Travel Expert, design a 14-day itinerary for exploring the best national parks in the United States. Include stops at Yellowstone, the Grand Canyon, Yosemite, and Zion. Suggest scenic hikes, wildlife viewing opportunities, and camping or lodging options. Provide tips on park passes and sustainable travel practices. 
<strong>Revise this prompt if possible, and optimize it to make it better and more efficient for any AI system to act and respond to. 
If possible run your optimized version.</strong>