Hume Lake Loop

This spot is less than four hours from the Bay Area and offers everything you would ever want to do in the outdoors. The interesting thing about Hume Lake is that it is actually a Middle School and High School camp in the Summer and Winter. That being said, it is not the place to go if you are looking to get some alone time in the woods. But because it's operated by the camp, you are able to use all the amenities there even if you are not a camper. 

The fishing is awesome and you can even rent a little fishing boat or kayak if you're looking to get out on the water as oppose to sticking to the shore. There is a great 3.5 mile hike around the lake with awesome little pop out views of the lake. During the winter though you cannot fish, the hikes are still awesome and the area just as beautiful.

Being that the closest city is Fresno I would not suggest a day trip if you are visiting. There are a number of campgrounds around the area if you are looking to camp on the lake (book here) or you can rent one of the local cabins as most are vacation homes for the owners. 

There is no service in the area but the camp has literally everything you could need to supply yourself for your stay. There is a small restaurant, general store, gas station, restrooms, and even a Charter School if you fall in the love with the place and want to settle down and raise a family (which definitely happens).

Again, this is not an experience for those trying to escape but there is not a better spot for pure outdoor fun than Hume Lake!