There is a faint path from the summit of Iroquois down to Algonquin Pass. Following it carefully will help you to avoid the cliffs. Head down to Shepard's Tooth, then stay to the right of the tooth and continue down the "drainage". You might want to wait for the snow to melt (although since this is on a southerly exposure there may not be much snow there now.) Once in the pass, turn right on the trail and you will quickly find a cairn marking the start of the Marshall path.