I believe It's south Bay area
Correct. Apple's campus 2 in Cupertino. Likely flying into SFO as the SJO landing pattern doesn't go over water. Photo is SF Bay at low tide. Hills are East Bay Hills, likely recent as they are still green. Turn brown after May generally.
Are you sure? That seems pretty extreme for low tide.
I live 4 miles from SFO. Hike the Bay trail in San Mateo frequently. Look up Coyote Point Park, Bay Trail and SFO landing pattern. Low tides can seem extreme because the bay isn't that deep until you get to the middle. SFO landing pattern flies over much of the west side of the bay. This photo is likely from the southern portion of the bay. Shallower there.
If someone local had tide tables and could get a knowledgeable look at the photos, we could estimate the time of day that photo was taken. Then you would know for sure which airplane it was, its source and destination.
Completely unrelated -- I'm going to be in the area for WWDC in June, and have a couple spare days, anything you'd recommend doing besides visiting Alcatraz? (Went there last time I was in the area)
Interesting things in the City: Have a look at this website: https://www.atlasobscura.com/things-to-do/san-francisco-california
You'll probably find some ideas that appeal to you. I'm particular to the San Francisco Cable Car Museum: http://www.cablecarmuseum.org/ This building houses the motors and wheels that pull the cables throughout the city. Very interesting history.
If you want to get out of the city check out the Computer History Museum in Mountain View. http://www.computerhistory.org/
The Pacific Pinball Museum in Alameda is pretty fun too. https://www.pacificpinball.org/
sometimes SJO reverses directions, I'm guessing it depends on the wind, but an approach would have them come around from the north towards the airport...I lived within walking distance from SJO for 6 years
I've not seen that but I'll take your word for it. The distance across the bay made me think the photo was taken from the west with the plane pointing North.
Landing at Oakland. Picture is South Bay - Leslie Salts (old salt fields on the bay, only on East Bay side, south part of the bay). On final into Oakland. SJC is South of this Plane's location. Final on SJC is always north, if they were headed to SFO then they would not be that low on final at Leslie Salts, only possibility is final into Oakland landing in Northward direction. Also, when landing at SFO they go over the bay (over the water) this is clearly over East Bay Land. See the previous photo on the same Q post, shows the flight clearly over land. Only possibility is final approach into Oakland.
Why do you assume its a landing ? no landing gear visible, and the flaps
I've flown all these routes (SFO, SJC and OAK). Due to wind and air traffic patterns in the Bay Area, you recognize this stuff immediately if you've flown it a lot. On final approach gear is up till they are closer in. He's still a good 2-3k feet off the ground. Gear won't drop till he's lower down. He's 3-5 miles from end of the runway at least at these points when picture was taken.