Thanks for all your wonderful suggestions! I'm not *too* concerned about the "cold" weather these few days because they're from Wisconsin, where it's freezing and covered with snow. I'm sure upper 40s, lower 50s will feel like the Bahamas to them.
On Saturday, I thought we could definitely do the manicure/pedicures, take a tour of my school (Stanford), and perhaps go shopping (Westfield is quite large and fun).
Sunday is for Monterey Bay and the aquarium there. It will be a nice drive, too.
For Monday, I made reservations for the Ritz Carlton San Francisco Christmas Day brunch, and I thought afterwards, we could do a walking/driving tour of SF (Chinatown, Golden Gate Bridge, Golden Gate Park, Palace of Fine Arts, etc.) OH! And this will be the first time my mom meets my boyfriend...wish me luck!