Stanford Medical Park is a godsend for those who have schedules that make it difficult to make it to an office for an appointment. They are open later in the evening and on weekends. Anyone with kids can attest that they rarely get sick until after everything is closed! I would not go first thing in the morning unless you have an appointment (and they don't like taking appts.) so I would wait until mid-afternoon unless sitting in the waiting room full of germs appeal to you.

PROS: Convenient hours
CONS: Long waits