Rugged but rewarding trek is best way to see East Bay backcountry Ohlone Wilderness Trail is one wicked walk: 28 miles in two days with over 7,600 feet of elevation gain. But it's worth the strain as you soak up amazing vistas, scout for wildlife and marvel at being in such a remote locale so close to a huge metropolis. (Large raptors like eagles and hawks can often be spotted swooping down on their doomed prey). Parks form the trailheads at both ends of the trail: Mission Peak Regional Preserve in Fremont on the west and Del Valle Regional Park in Livermore on the east. The trail passes Rose Peak, the highest accessible point in Alameda County, and traverses Sunol Regional Wilderness, one of the East BAy's premiere hiking destinations. Trails can get crowded on weekends at Mission Peak and Sunol, but the rest of time you'll have the trails largely to yourself (and a few grazing cattle.) Late winter and early spring are the best times to go because the temperatures are cool, the hills are green and the wildflowers are in bloom.