I am pretty certain any fun you think you will have will be short lived before the pointlessness of existence starts to weigh on you to the point you either go insane or kill yourself. The thing about all that stuff in the stores is it really only has value because of how much it costs and without the price, it ends up being ultimately worthless to you as you grow used to having everything and it no longer means anything to you like it once did when you couldn't have it or the status that goes along with having it. Life would become a drudgery both due to the work involved in staying alive along with the absence of any real purpose for living especially if you were all alone.
Also, I believe Joshua Farrell's topic clearly stated there would be no one else left but you so any ideas about doing things with other people would be impossible at least in the way this topic was written.