Miis can drive around both Wedge Island and Wuhu Island. All cars on the islands are electical, as well as all capable of going offroad. Cars come in many different colors, and some have balloons tied to the back of them.
In Wii Sports Resort, most of the cars in the game are normally seen on the main street, the Island Loop Road, which goes right around the island. However, they can also be seen offroad and also at the Hillside Cabins.