It's time to sign up for free summer bowling! Sign up at Kids Bowl Free, and your kids can bowl two games a day (per kid) for the summer. Dates depends on the specific bowling alley, as does shoe rental rules (for some it's free, for others you pay). If you think you'll be bowling as well, purchase the family pass starting at $24.95 and you'll get two games per adult per day (up to 4 adults) as well. You can sign up with more than one bowling alley, but you have to reregister using a different email address (this is kosher, according to the website).
The Bay Area locations include Daly City, Albany, Castro Valley, Palo Alto, San Mateo and South San Francisco.
We did this last summer. To sign up, pick your bowling alley and register on that page. After signing up, you'll get an email a week with your bowling coupons (or you can log in and print them). That's it!