If you're looking for a challenging hike, Echo trail is the place to be!  This is by far my favorite hike in Phoenix. It's only 1.2 miles long but the incline makes it feel longer.  \nIf you are looking for an moderate hike, you can do Cholla trail.  I do agree that it is easier 1.5 hike, but it's can bet tricky.  You need to pay attention to where you are going of you can easily loose the trail.  Some areas are super narrow and steep.\nRegardless of what trail you choose, make sure you take some fruit, trail mix or protein bar (these are just suggestions) and enjoy when you get to the top while enjoying the view!  Happy hiking!