Mission Cliffs is a great place for someone to try indoor rock climbing for the first time. Day Passes (weekdays after 3 pm and weekends) are $18 and if you arrive before 3pm on weekdays, it's only $10.
They have tons of walls and the staff is friendly and helpful. They'll rent you anything that you need. Bring your own sneakers so you can save a couple bucks and not have to rent. They give routes a "difficulty" rating, so you know what you're getting into.
With your day pass, you have access to the free-weight room, aerobic machines, and sauna.
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