Store the battery on some cardboard or newspaper in the house somewhere out of the way. This will help the battery stay fresh. Put the bike up on its center stand if it has one. Make sure the tires are properly inflated. Be sure that there will be no water or ice near the tires.
Water can collect in the treads of the tire, and possibly freeze and expand.
This will stress the rubber. If you want, put some plywood under the tires to keep them insulated from the ground. ArmorAll the rubber stuff. Put baggies with rubber bands over the tail pipes to keep moisture out. A light coat of WD40 or the like on the bare metal and chromed parts may help prevent oxidation.