i dont know much about the area up there. I know guys do fish those lakes that C.C. mentioned above. I think there was a huge algea bloom in Anderson last year that made them shut down the lake if i remember correctly. Almost all the lakes around here require some sort of boat or tube because there is little to no bank access that allows you to cast a fly.
The salt up there should be good, but i have never fished it. i would imagine that the oyster beds and gravel shorline in discovery bay would have some nice cutties. I dont know where to point you up there, but if you explored with a boat i am sure you could find some fish.
good luck