One of the most spectacular -and popular- hikes in Sedona is Devil's Bridge. You'll hear many people say it's overrated and crowded, but we've been twice on weekdays during spring and autumn and we did not encounter crowds, so we'd say that with a just a bit of planning, you will have a great experience. Easy to moderate trail if you have a basic fitness level. If you have a 4x4, it's about 2 miles (3.2 km) round trip from the Devil's Bridge trailhead, otherwise park at Mescal trailhead and it's about 4.2 miles (6.7 km) round trip.