Equipment:
A pool
A boom box or radio
Nose plugs

Description:
Synchronized swimming is a fun and difficult water sport that requires the execution of a routine to music. The goal of the performance is to interpret the music with technical skill, style, grace and precision. Good routines are not always as easy as they look.
Pair off into teams and work up a routine together to your favorite tune. When routines have been practiced and are ready to show, take turns performing them before the judge. Best routine wins the gold based on creativity, musical interpretation and precision skills.

Other comments or suggestions:
Use 2 teams of 2 persons minimum and 1 judge.
You can make your own gold, silver and bronze medals with construction paper and ribbons.
Or rewards can be food based: ice cream, cookies, and chips.
Or rewards can be chore based: 1 free night no dishes, 1 free day of not making your bed, 1 extra hour of TV time.
Have fun with it. Let the family decide beforehand what today's Olympic rewards will be.