From the city of Walnut Creek website:
September 8, 2012 Sugarloaf to Shell Ridge and back
Join Mayor Bob Simmons at 8:30 a.m. Saturday, September 8 for a walk in the Sugarloaf and Shell Ridge open space areas. Meet at 8:30 a.m. at the Orchard Trail sign at the Sugarloaf Open Space area. The walk will cover about 4 miles on some uneven terrain. There are two moderately steep sections, with about 1000′ cumulative elevation gain. Be sure to wear sturdy walking shoes, and to bring water and sunscreen. Click for walking guide.