Rock Lake Beach B is an expansive beach located within Algonquin Park’s Rock Lake Campground. This beach offers many activities for beach goers including swimming, kayaking, fishing and canoeing. To ensure water safety, Rock Lake has a small selection of lifejackets to provide beach goers with. Rock Lake Campground also offers modern amenities with flush toilets, showers, and laundry facilities. Pets are not permitted. No lifeguards, water safety is your responsibility. Life Jacket Lending Program available.