So, we headed over to the north and, apparently, lower tower, dropping 600 feet awfully darn quickly, only to have to immediately start climbing right back up again. (In general, we don't climb as fast as we descend.) On the way back up, we kept ours eyes open for any semblance of a trail. Just above, John bushwacks following something that petered out to nothing but at least we were getting views here--south toward Lake Samish. We were above the clouds and the cloudbank over the lake was stunning.
Just before reaching the north towers, the road splits, go left and make for the near tower a couple hundred yards to the south; that's where you'll find the trail. (Did anyone else notice a change in the authors' point of view?) In fact, just above, John is standing right where you'll find it. The trail goes south for a few hundred yards across a clear cut, then just before entering some trees, turns left and drops steeply across and down the hillside. (There was some pink flagging in the trees, but I wouldn't depend on it being there forever.) Our bikes on our shoulders, we hike-a-biked for about 10 minutes until we found ourselves on a gravel road overlooking Lake Samish. We were now on the south side of the mountain.