You mean besides being here and reading and answering ( maybe ) the questions from the wide range of folks on Ask ? This alone has and does keep me amused, dumbfounded, etc., etc......lol. Being 90 and in a nursing home kinda limits what is available......would depend on what is allowed by the home ( can he have a small pet maybe ? ) and what he is capable of doing ( can he use the computer ?).....what does he want or like to do ? Hard to answer something like this without knowing more about the situation.
Some of the best activities that you can engage in are playing board games. Find some friends that you can hang out with and spend some good time with. The homes should also have activities that you can engage in.
Get some of the other people to get into some easy activities like playing Poker and Bingo ! At least you have other people around you to help you think of some good things to do ! I love a good game of 5 card draw ! Get some of your friends together and talk about it ! Hope you find something good as I'm no youngster either , but I love my Poker !