I don't reply to posts, mainly because I have nothing to offer to the discussion but in this case I might be able to help.
The Manitou you are referring to has mainly lake trout and smallmouth bass. I usually fish Emerald Lake which is just up the road from Manitou.
There are many lakes in the area but the only one that I know of with walleye is Gull Lake. Never been there but I have been told that the drive in is "rough" from local guys. If you have a 4x4 you don't mind beating up I'm sure the lodge owner would point you in the right direction.
If you plan on fishing Manitou, lake trout should be high enough that you don't need downriggers or lead core line to catch them. I have caught them in the spring on spoons but most of the time I use a lake troll of some kind with a threaded minnow on a treble hook. With normal tackle I use the smallest one I can find.
Hope this helps.