There is a nice harbor just a few miles north of Duluth called McQuade. You can bobber fish in the harbor or just off the break walls in the main lake. Then just south of McQuade is the Lester River. You can fish off that river. North of the McQuade harbor are many smaller streams but try French River up a little further. And when I say River, I mean, you will fish the Superior shoreline just outside the river unless you are into river fishing. But that’s a different story.
Toss out one line on a bobber with a spawn sack of eggs and throw around any other cast and retrieve bait for your second line in to the main lake. See http://www.kamloopsadvocates.org/ for some more details.
Pretty easy to fish these areas and no new knowledge or gear is needed.