Park Patrol is a good example of an early 1980s video game. The concept is simple and the graphics are bright and colourful.
As a Park Ranger in charge of a park that has fallen into chaos, the player has to clear up litter and watch for swimmers in distress. The local wildlife (including snakes, turtles and ants) will get in their way, along with the swimmers and various tree logs that bob up and down in the river.
The Park Ranger's energy will gradually diminish, so the player also has to return to their hut to eat food to keep it topped up. Unfortunately, in later levels the ants begin running off with it!
Turtles are dangerous to the rangers when on land, but when in water they can driven over (in the dingy) for extra points.
The player spends their time split between rafting down the river in their dingy and exploring the river bank as they try to keep the Park safe and under control.