Thomas Creek is long (about 2000 feet) and has plenty of room for a long, straight-in approach, if you're going the right direction (south, I think). The other direction would work, but require a dog-leg on short final to clear a hill.
Upper Loon also allows a very long straight-in approach, that takes right by a very scenic cliff, which does not really get in your way, but makes the approach very asthetically pleasing. Long runway also. This is also a landing to the south.
Wilson Bar is my personal favorite. It requires you to fly over northbound rather high up, to get a look at the runway and pick out landmarks. It then requires you to decend deep into the canyon and follow it's twists and turns as you decend to the correct altitude. You don't see the runway until you roll out of a right turn onto short final. By the time you see it, you are only a few hundered yards away from the threshold and shoudl only be a few hundred feet above field elevation. If evereything doesn't look right at this point, turn left and head up river for a go-around. Past this point, there is no go-around, as there are tall trees on both sides of the runway, and a steep hill at the far end. The runway goes part way up the hill, which can help stop you if you come in hot, but best to not come in hot or high.
In general, it's best to avoid all of these in windy conditions, as it can get quite turbulent in the canyons.
If you don't have the "Fly Idaho" book yet, do pick it up; it's invaluable.
Andy