What an adorable place to hike, so quick and easy, in and out. It took me 45 minutes to hike up the most prominent hill and loop around back towards the parking lot. I usually hike South Mountain and once I start I can't stop, I want to be out there all day exploring new trails. Luckily, Thunderbird doesn't have that many options; apparently it has 15 miles worth of trails but it seems small. This is also the cleanest place I've hiked, I didn't see once speck of trash. If I lived in the area I would be out on these hills every morning. The trails here are super easy and I would recommend it to beginners.