The Zebra Slot Canyon is one of my favorite hikes in the Grand Staircase-Escalante area. The red, smooth, striped walls make for unique photo opportunities.
Willis Creek Canyon - Grand Staircase-Escalante NM, UT
Rainbow Bridge - Rainbow Bridge National Monument, UT
Rockefeller Loop - Humboldt Redwoods SP, CA
The Rockefeller Loop is one of the best hikes you can do in Humboldt Redwoods - it's easy, short, and gives you everything you could want in a redwood hike - tall trees, an open under story, and both a river and a creek to relax by. The 7,000 acre Rockefeller Forest is also the world's largest contiguous old growth forest of coastal redwoods.