Kinbrook Island Provincial Park was not established as a provincial park until 1951. Next to the park is the Kinbrook Marsh. It is one of three marshes on Lake Newell along with the Sven Bayer Peninsula and Pelican Island.
Much of the park is out in the open with some tree cover provided on the outskirts of the park. In the centre of the park, where much of the attention is focused, is McKay Lake surrounded by grass lawns.