Arizona
South Kaibab to Bright Angel Trail – Grand Canyon National Park
Distance: 16.5 miles
Days: 2-3
Difficulty: Strenuous
Best Season: Mar-Apr, Sept-Nov
California
California Riding and Hiking Trail – Joshua Tree National Park
Distance: 37.5 miles
Days: 3-4
Difficulty: Easy to moderate
Best Season: November-April
High Sierra Trail – Sequoia National Park
Distance: 73 miles
Days: 6-9
Difficulty: Strenuous
Best Season: July-Sept
Lost Coast Trail – King Range National Conservation Area
Distance: 24.6 miles
Days: 3-4
Difficulty: Moderate
Best Season: Apr-Oct
Panamint Dunes – Death Valley National Park
Distance: 8 miles
Days: 2
Difficulty: Easy
Best Season: Nov-Mar