San Diego Lakes
Most of the fresh water lakes in San Diego are actually reservoirs. We are incredibly lucky here because these valuable resources are also open for public recreational use. Not a normal situation, San Diego is widely recognized as a pioneer in the multiple use (for recreation) of water supply reservoirs.
The public has access to all of the City's reservoirs for a ton of outdoor activities including fishing, boating, hiking, picnicking, waterfowl hunting, [yes, hunting] etc. Also, you can get in on the water contact program if you like with seasonal access for water-skiing, jet skiing and windsurfing!
Here is a link to the San Diego Water Recreation website for current access, permit, and fees information.