I always check brake pads, chain/sprocket, battery connections/fluid, antifreeze, a once over on all bolts/nut during every service. your life depends on the operation of that motorcycle when you are on it, so you cant never short yourself checking everything once and some things twice.

I made up a check list/sheet of everything I should inspect on a routine basis, had it laminated and during each service, I use a magic marker and check each off as I check part, at the end of your service, you just have to use a paper towel to wipe clean and you have a new list for the next time.