I live locally to castle rock (wisconsin rapids). The lake can be very tough to fish but if you find them it can be phenomenal. Since you will be in kayaks I would advise you to stick to the river on the north end of the lake, seems to be the highest concentration of fish up there generally. I Throw lots of black and blue out there, springtime you can be productive with rattle traps, and cranks on rocky inside river bends. Otherwise flipping into any piece of cover you find generally will work.