What do you have as far as a boat and gear? Riggers?
Morning, evenings and overcast/choppy days you can fish the surface otherwise you want to get down to the bait or thermocline so best to have a good sounder and riggers. Spoons, hoochies behind flashers, apex and small tomics all work well. Green and silver, blue and silver, watermelon, skunk and various UV colours all work well. If you want rainbows, don't troll too slow. Bucktails on top work when low light - morning, evening, choppy/overcast. Focus on major points, river/ck mouths, rock bluffs, the Narrows or, assuming you have good electronics, anywhere you are marking balls of bait (shiners or schools of sockeye/kokanee fry).
Lake gets VERY busy from now until end of August so wake/ski boats and other pleasure boaters can be a PITA any time other than early and late, I avoid that lake in July and August for that reason. Still, fishing can be great when its on.
Cheers!
Ukee