What model Malibu do you have? I looked on their site and didn't see any at 9'4''. Is it a sit-on-top, or sit-inside?
Tomales Bay can be calm and flat and as easy to paddle as a lake, especially the south end. I've taken several newbies there and they've loved it. It's beautiful in nice weather.
The farther north you go, the more swells and current you get into, and it can be downright treacherous at the mouth. You can almost pick the conditions you want there.
It's a great place to learn saltwater paddling, and has some good fishing, too!