Maybe life is meaningless, but you can still make a really good sandwich. If nothing else, pursue pleasure. Or throw yourself really deep into transcendental meditation and see what happens. Try learning a bajillion languages and see if your thought processes change. All of those are bound to be more interesting than killing somebody (I hope). Sure, in enough time, none of it will matter, but you can at least push the envelope and test the boundaries and all that. Make your life an experiment. Assuming you don't have any dependents, that is.