Spectacular Bay Views and Wildflowers (while still in season, here in April) at Coyote Hills Regional Park near Fremont .  
 Algae on the bay makes for unique photo 

 Rock formations atop Red Hills at Coyte

Spring wildflowers line Coyote Hills trail, above and  at Sycamore Open Space and Sunol Ohlone Wilderness Preserve ,below- Sycamore ridge trails and  is one of the newer additions to excellent Eastbay Regional Park system: take Sycamore  Valley Rd east to Camino Tassahara,left on Holston (sp). Sunol much more expansive for longer treks