I might as well! If I only had one month to live, I might as well tell my family. I have to think of which is worse: Them finding out when it's too late, or them finding out sooner so they can be...more prepared and expect it, I suppose? Though part of me doesn't want to tell them, because a lot of them worry too much and it's fairly bothering.
And with my remaining days, I'd just go to as many places as possible! Probably just a theme park here and there, and as long as I had fun, that's all that would really matter. Sure, I'd be scared on the inside that I'd be dying a little with each passing day, but in a sense, I'd just accept it.