Sinclair Wash Trail is a 4.2 mile out and back trail located near Flagstaff, AZ and is good for all skill levels. The trail is primarily used for hiking and is accessible from April until October.
I actually usually bike this trail several times a week. It's well maintained and cyclists, hikers and joggers share it amicably. Once you get out to Ft. Tuthill fairgrounds there are a number of other trails encircling the area, so you can expand your adventure accordingly. The trail is part of Flagstaff's Urban Trail System (FUTS).