UMRules is right, Mason does have a lot of perch, as well as bass. They also fish for kokanee. Be advised that as the weather warms up, Mason can be very busy with jet skis, water skiers and others. It's a big lake and the Simpson area is at the opposite end of the lake from the county boat launch. Not a pretty launch and the park is very small, no camping. Another option would be Spencer Lake. It has some nice fish, but also has the boat traffic as it warms up. Of course, the way the spring is going, "warming up" seems like a long ways away. We'll be up at Mason for the weekend starting Friday.

Good luck in your quest, let us know how you do.