Line a 9 inch loaf pan with cling type wrap.  Whip cream until stiff peaks form.  In a bowl combine 2 cups of fruit and lightly smash with a fork.  Reserve the other 1/2 cup for the topping.  Line the loaf pan with a layer of graham crackers, top with whipped cream, then a  layer of fruit.  Repeat for three layers.  The last layer will be the reserved fruit that has not been smashed.  Wrap tightly and freeze for 4 hours.  Remove from the freezer - slice and serve.  Drizzle with chocolate syrup, if desired.