i don't know anything about the peninsula but there's coho's in all the "s" rivers in october, then in november there's chums, but they're good for the fight and no good to eat out of the rivers. steelhead can be really good in those months too. if i had to choose a place to go steelhead fishing in october i'd go to the grand ronde or the deschutes in oregon.
gear fishing i assume?
i also don't really know of any guides to recommend. you might talk to hoytstaffshooter.