We have so many beautiful trails all over Arizona so it's hard to pick! I love McDowell Mountain Regional Park and one of my favorite trails to run there is the Escondido Trail.
This trail has fun switchbacks and what I call “roly-poly” hills. It's fun to go up and down them like a roller coaster. It's mainly singletrack and the views are spectacular. It's in the Arizona desert, so plenty of saguaros and cacti. Flowers will also appear in the spring. I've done this trail during a night race and it's just as fun at night! Although it's showing as an out and back trail, towards the end of the trail you can link up with others in the park.
It is closer to a road than I would normally like, but it's never bothered me since that road is not heavily trafficked (at least not the early mornings or nights). There is no shade so be prepared to be in the sun as well.
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