The Gemini Bridges trail is used by both bikes and 4-wheel drive vehicles. This is a broad rocky gravel road, with some steep sections and one stretch of ledgy slickrock. As an out-and-back from the highway, it’s 16 miles round trip. Total climbing is about 1500 feet, in 3 sections of 500 feet each (two on the way out, one on the way back). The trail isn’t tough, but it’s long. Experienced beginners can make the ride, but consider the length of the ride and the long uphill climbs before deciding whether this ride is right for you.