Some things below can be researched here:
http://stelviontx.blogspot.comGrease suspension linkage and splines
Add fuses to the fog lights (this is a must! see link above)
Euro turn signal upgrade- this will rid yourself of the terrible turn signal/mirror combo used in the states only (link)
Upgrade horn if you want to be heard (link)
I have one rear rack left that you can attached a SW Motech top case (same as side cases- link)
Double bit locks for the side cases- the single bit locks are not great (link)
Keep a spare lower crossover exhaust gasket when yours goes south (link)
Spark plug cap replacement (link)
Add heated grips to the factory connectors if needed (link)
Look up the procedures for valve check, fluid change (link), and throttle body balance. Those are about all the things that you can easily do at home.