The UU "Seven Principles and Purposes" seem like a piece of virtue ethics. If you don't mind this particular brand of it, then why not.
From Wikipedia:
"We come from One origin, we are headed to One destiny, but we cannot know completely what these are, so we are to focus on making this life better for all of us, and we use reason when we can, to find our way. "
If you discard the ornamental fluff in this "philosophy" and "focus on making this life better for all of us", then it's as good a guideline as any.
As I said in responding to another comment, this is the part of UU that I relate to. However, the problem is that while UUs might be slightly above average rationality, "we can use reason when we can" means that beliefs come from thinking for yourself as opposed to reading e.g. the bible, and the stuff they come up with by thinking for themselves is usually not all that great by my standards. I am worried that I am giving UU too much credit because they happen to use the word "reason," when in reality they mean something very different than what I mean.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.