Follow the directions on the Smith Rock Group main page to reach the base of the west side of the formation. Once on the west side, you're looking for a low angle brush gully (numerous climbers' trails exist) to take you up to the summit plateau (class 2). This photo clearly shows the gully and the summit plateau: Smith Rock Group from the west. Once at the plateau, hike left (north) until you see The Arrowpoint directly ahead of you, The Platform ahead and to the right, and the Smith Summit spires way off to your right.
Smith Group spires overview shot (from the east) is here.
The route begins with an easy (class 3) but a bit exposed scramble along a chossy ridge to the south base of The Arrowpoint. Contour left under the west face of the formation. Downclimb (class 3) a few unexposed feet along the northern base of The Arrowpoint. Scramble to the west base of The Platform. Follow easy rock to the top. Note that the rock here is horrible. Move with caution and assume all holds are portable.
A single new bolt has been placed in on the summit (the rap biner on the bolt was left there 12/2003 and is trustworthy). Though you should probably not rap off a single bolt in bad rock, you can use it if you wish to set up a hand line for the downclimb.
Bring a rope to belay your second but it's useless to the leader. Leave gear at home. There's nothing other than caution you can use to protect yourself in this crappy rock.
If you have information about this route that doesn't pertain to any of the other sections, please add it here.