This is an easy network and immpossible to get completely lost. A few of the stretches you can take at high speeds, but the semi-large chunky rocks will slow you down. This is a ride I do in the middle of summer, mid day. It usually isn't too bad, unless it's really humid, which is rare. Even then we rode for over an hour. It's not for the beginners because of some of the climb, and it gets you winded if you're going fast enough.
Review: Papago is good because it is close to downtown and makes for a quick ride after work. There are tons of trails here. Most of them are fairly loose over hard pack and you can washout easily if running too high of pressure in your tires. The hole in the rock and tomb make for great photo ops.
Review: The Papago Trail area is a great area for the beginner and intermediate rider. There are a variety of trails that range from flat, sandy turns to loose climbs and quick descents. There are a few jumps that have ride-arounds.
Review: Good trails. Most are pretty easy, but you can leave some of the more well-groomed trails and find some tougher stuff. It's usually the place I bring beginners to let them find their sea legs. It's also a really convenient location, and there's usually plenty of parking.