3200 California St.
San Francisco, CA 94118
Most people know that the Jewish Community Center has a great gym, but there are more things to do there than just work out. Sure, the facility is clean and there are locker rooms, but the kids also have a place here. However, you may want to check the website before taking a trip there, because there are many days and times when some things are open and some are closed. The fitness center is often open when the front desk is closed, but on many holidays (i.e. Passover and Rosh Hashanah) when everything shuts down at sunset (6 pm).
For another example, the second-floor kids' playground is open seasonally on the weekends, between the start of April and the end of August. The library is open at certain hours on Wednesday and Thursday, but there's also a pushcart that can be accessed on Monday, Tuesday, and Friday.
However, the Community Center also offers a vast range of programs. The fitness center hosts Pilates and yoga and swim classes. You can even get a spa treatment or massage if the muscles cramp up. The Arts & Ideas theatre hosts concerts and lectures, so you might hear Grease showtunes and the Maccabeats one week, and see cooking shows on hummus and falafel the next week. If the Monday clay and wine classes don't grab you, maybe a photography or driver safety class will.
That's just a list of what's geared toward the adults. Your kids can fill in off days by signing up for camps during school breaks, attending an award-winning swimming school, molding clay or sculpting ceramics in art class, dancing through gym class, or combining all of those things by joining the afterschool program. If your older kids really want to stretch themselves, there's always chess club or language arts or cooking classes. The mixture of sports and arts should be enough to keep any family occupied, and if there are any gaps – there's always the Urban Gardening classes.