We had a blast at Trout Dale, 2468 Troutdale Drive, Agoura, just off Kanan Road before Triunfo Canyon. Trout Dale has been around for 40 years and has 2 ponds nicely stocked with fish.
For $7 per person (as of April 2012), you get a bamboo fishing pole, corn bait and bucket. For another $5 you can buy worm bait, which we did. My boys loved it there, though for the wrong reasons...they quickly lost interest in fishing as they were fascinated by the worms (which we subsequently brought home and now reside in our lawn).
If you catch a fish, you can't throw it back in the pond. You gotta buy it. It isn't cheap. But for the experience of fishing right here, minutes away from home, it is worth it (not to mention the savings in gas and time compared to driving elsewhere). The staff there was very nice and well accustomed to the clueless urban non-fisherman types like me. For a nominal fee they will gut your fish for you. This place is a gem. Like visiting the set of The Andy Griffith Show. For more info and pictures, visit www.allyoucanfish.com.