This is the world-famous Slickrock Trail near Moab, Utah. This 10.6 mile lariat loop twists and rolls through Navajo sandstone to a breathtaking view over the Colorado River. The Slickrock Trail is rated high technical difficulty and high aerobic requirement. But many MANY "not-very-good" bikers ride this trail, with many short hikes over the tough spots.
Some of the climbs are incredibly steep, requiring you to stand on the pedals with the handlebars right up against your body. Most riders (probably 98%) will push the bike up at least a couple of slopes. In all, you'll do well over 2500 vertical feet of climbing.
As the home of the most famous bike trail in the world, Moab has more bike stores and motels than many large cities. It's about four hours from the Salt Lake City airport, and you can rent your bike equipment when you get there.
A slickride from many years ago...
Starting from the parking lot, you'll reach a trail fork after 1/3 mile. Her the main trail goes to the left. Straight ahead is a short (1.3 mile) "practice loop." The practice loop ends on the main path about 1/2 mile from where you are. Go left if you aren't sure you can handle the extra distance and work of the practice loop; right if you're doing everything or only the practice loop.
There's also a viewpoint spur to overlook The Abyss on the practice loop, 0.5 miles from the outgoing trail fork. This short segment is only 1/10th mile long, so it's worth doing.
Slick Rock Practice Loop
You'll get entangled with the Hell's Revenge 4x4 route in a gully at mile 1.8. Keep straight and right to climb away from the 4x4 path.