I've fished Whitefish Lake in Ontario for several years, but that was 15 or 20 years ago. The fishing was phenomenal for walleyes for a while (every year our group would catch a few 8 pounders in a week), but they quality really went down in later years. Same goes for perch - there were tons of jumbo perch, but word got out and they took them out by the truckload during ice fishing season. I haven't heard how the fishing is up there these days though.
What time of year does your group plan on going? We always went in early/mid June. If you are going around that time, let me know and I can tell you know what worked best for us when we fished that time of year.