For what my opinion is worth, Where Eagles Dare looks doable, but I wouldn't take the Rusty Nail section.... that is a tough trail. I liked Flat Iron Mesa when I lived out there. You shouldn't get lost with a guide book, but taking a wrong turn off trail is fairly easy. It has a few nice obstacles and the narrow one (can't think of the name) is pretty fun. I didn't scratch anything, but it was close. Strike Ravine was ok. Not much to look at really, but was an ok drive.

Hope this helps a bit.