The Hillside Cabins or New Town in Europe are/is an area in Wii Sports Resort and Pilotwings Resort. They can be found in Wii Sports Resort when playing Island Flyover. As the name implies, the Hillside Cabins/New Town are/is little cabins on small hills.
In Wii Sports Resort, while flying over the Hillside Cabins, music and sounds from Super Mario Bros. can be heard. The nighttime description even talks about the music and sounds.