Since we all have different opinions of what life is really about–nothing is a one-size-fits-all–so “making the most of each day” is definitely open to interpretation.
For me, and I guess I could probably speak for my family and most people I know, “making the most of each day” for us would be continuing to pursue our dreams, because we find that pursuit interesting and fulfilling, or helping our families and others, or many other things. Things we may or may not be able to do after we leave this world.