Yep, we are talking about the same lake. I know Calls311 as well. I didn't know he was on this forum. I'd seen him out on the lake from time to time & finally met him this past year - he's a nice guy.
Great info about Berlin lake. I'd definitely like the tour in the spring. I've skied on the southwest part of the lake once with a friend who belongs to a private campground up there with access to a private ramp. Seemed like a nice, relatively protected area with few other boaters. I'm told their is a slalom course somewhere on that part of the lake - not sure if that's true, and whether it is a public or private course.