On Sunday, from 1 p.m. to 3 p.m., join North Mississippi Regional Park staff and challenge your family and friends to whistle an acorn cap and play rock-and-stick-tac-toe, and other fun games about nature.  As always, there is no fee for Free Family Fun Days, but Three Rivers Park District will take donations for its Wonder Fund to create opportunities for school groups and youth with financial need to experience the parks.

Tags: Free Family Fun, Minneapolis, Minnesota, North Mississippi Regional Park, Three Rivers Park District, Twin Cities, Wonder Fund