Grant Cook cools off in a plunge pool in Louisa Falls between Louisa Lake and Agnes Lake in Ontario’s Quetico Provincial Park. The falls are a 91-foot cascade between the two lakes, but about 20 feet down from the top, the falls take a short break and collect in a rock-rimmed pool. Sitting or swimming in the pool, with the water bubbling up from below and splashing down on your face from above is a perfect way to spend a warm midday in Quetico. My son, Grant, and I hit it just right on Saturday. The water was relatively warm, and the flow was good. We bobbed in the pool for a while, then dried off on a warm rock nearby and ate some lunch. Quetico Provincial Park is a 1.2-million-acre wilderness just north of the Boundary Waters Canoe Area Wilderness. The falls are about a two-day paddle from the Moose Landing east of Ely. A travel permit is required to enter Quetico. For more information, go to http://www.ontarioparks.com/ENGLISH/quet.html.