Be careful your fuel doesn't go off. Unless your using "Super", your petrol will contain ethanol, which absorbs moisture, the longer its in the tank unused, the more likely you are to have problems firing it up next year. Not likely to be a problem if the bike is fuel injected. If its a carburetor fed motor, then you'd perhaps be best draining the carbs
As an alternative, I believe that their is an additive that you can put in the fuel to prevent it going off, buggered if I can remember what's its called at the mo
Oil the chain so it doesn't go rusty while its standing
Make sure that you've washed all of the road salt off