Check with Oakland Parks to verify access for private boats. Long carry from parking to water. No motors allowed, except for 1.5hp electrics for fishermen. Generally pleasant environment. It's worth a paddle now and then.
Fishing is good, especially after stocking.
Shadow Cliffs, Pleasanton. Del Valle Reservoir, Livermore. Long reservoir with a low speed limit for power boats. Boat in group campground. Oak covered hillsides.