Bay seniors eyeing fresh horizons, might want to cast their glances east to the Sunol Regional Wilderness off Highway 680 south of Pleasanton, really not much further away than Mt.Diablo. Its 6,859 acres are not crawling with hikers like Mt. Tamalpais, for example. There is a plethora of trails, many not marked at all, winding up, down and around the echt California meadowlands. Get an eyepopping view from the sandstone outcropping on Maguire Peaks.