Lake O marinas hold lots of big pike, plenty of 40" pike around. My favourite technique used to be jerkbaits, my favourite was a suspending husky jerk. Cast it out, jerk jerk, and loooooong pauses, I have watched a pike stare at a suspending jerk bait for over ten seconds before deciding to hit it. Spoons like wabblers will definitely work and dead bait under a float is a good choice as well, but I've never found anything more effective than a jerkbait.