Before getting our own cottage, we've always rented from Springbank Camp (owned by Lyle and Myrna Brown) which is located in Roseneath (close to the middle of the lake). They don't have a place to tent but they their cabins are pretty cheap ($25-$30/day/night) and the boat rentals are $50 + cost of gas. The cabins aren't fancy but it has running water, toilet, showers, kitchen and most important of all in April/May, a wood stove.