Activities- The Bay Area's 3 airports Oakland, San Francisco, and San Jose all have their appropriate things to do....

My parents would rather not host something at home, so we should plan something away from my house.  >D

Possible things to do:

San Francisco
Pier 39
Fisherman's Wharf Lunch
Alcatraz tour
Blue and Gold Fleet Dinner Cruise

At your leisure:
Museums
Shopping (Union Square, Ghirardelli Square)

Options:
Drive to Garberville
Have Bud and Evie visit so they aren't overwhelemed :rollin

Within a 2 hour drive south (touristy spots)
-Monterey (Cannery Row, Aquarium)
which is near
-Carmel 17 mile drive (scenic)

North-

Bodega Bay

Drive 3-5 hours:

Yosemite
Bud's (Garberville)

If you would need transportation from me, SJC would be the best bet, a hotel in Fremont/Newark would be good, and I could drive 6 other people to the BART station where we can catch a train into the city. It's about 45 minutes station to station.

In the city: Getting around can be tough, you can rent a car and park, or take MUNI (buses, streetcars) around, both of which are a bit confusing. Getting to certain attractions such as Golden Gate and Lombard street would be easier with a car.

SFO arrivals:
Would suggest stay near airport- San Bruno, San Mateo, Burlingame, South San Francisco.

OAK arrivals:
Airport location is easier, free shuttles, and a connection to the BART station for easy access to Fremont or SF for Palooza activities.