Gather materials that represent different space figures (boxes as rectangular prisms, balls as spheres, etc.) and create a robot or outer space figure.
With a set of Legoes, with a group or alone create a Lego City according to the specs or guidelines at this link: Lego City
Make a collage of different objects that represent different polygons. Label the polygons they represent.
Create a chart of animals with bilateral symmetry and those with radial symmetry.
Create a design on graph paper and plot the coordinates. List the coordinates on a separate piece of paper so that someone else can reproduce your design on a piece of graph paper.
Measure the perimeter, area and volume of an area or object (your room, your fish tank, your classroom, refrigerator, etc..)
Compare the diameters of the planets on a chart.