PVC pipe wrecking ball to knock over block towers/castles. Great eye/hand coordination required to aim, could also vary the weight and type of objects used as the "wrecking ball." Plus, it's just fun to knock stuff down, isn't it?
Have a square of tape on the ground, do a version of the hokey pokey. Have the students jump in and out of the square, walk to the right around the square, etc. This would be a good large motor activity to get preschoolers moving about.