When my dad was in the early stages of Alzheimer's and went to senior care during the day, they played bingo a lot--and all the folks just loved it. Hard to do if you don't have at least three or four players, but maybe you can scratch up some others to play.

An activity I did with my dad, before his memory got too bad, was to put all his old navy photos into an album, organized loosely into decades, and then to start asking him about each group of photos so I could write in the info. It was remarkable how much he remembered that I had never heard, like that a certain weapon created a heart-shaped pattern with the stuff it fired into the air, and that his mother had a neighbor who would leave her a little jug of corn liquor in the knothole of a tree in her yard, since his father wouldn't allow the stuff in the house. These bits of knowledge were complete revelations to me, and now we have them written down and preserved for his grandchildren.

Just some ideas.