Discuss the sizes of each planet, as well as the size of the sun. Make a list of the planets in order from largest to smallest. Make sure to put the sun at the top of the list, as it is bigger than any planet in our solar system.
Use a large pumpkin (55 inches wide), large mango (5 1/2 inches wide), large orange (4 1/2 inches wide), plum (2 inches wide), kiwi (2 inches wide), grape (1/2 inch wide), blueberry (1/2 inch wide), pea (1/4 inch wide), coffee bean (1/5 inch long), long grain of uncooked rice (3/32 inch long), short grain of uncooked rice (1/16 inch long) and poppy seed (1/64 inch long) to represent each planet (the pumpkin would represent the sun). Assign each planet to a fruit, vegetable or grain.
Discuss the distances of the planets from each other and the sun. Take note of these distances and prepare a scale model. To do this, you will need a large field area. Place the pumpkin (the sun) at one end of the field. Plot the other fruit/grain/vegetable accordingly.
Discuss the surface of each planet. Figure out whether or not the surface of the representative fruit is a good example of that planet's surface. If not, use markers to draw on planet features. You could even scrape out some of the outer skin to create "craters" to better represent the surface of that planet.