My elderly neighbor lives alone, and can no longer walk the distance down his driveway to pick up his newspaper, so every morning when I'm walking my dog, I place his paper right by his front door so all he has to do is open the door and pick it up. A small thing but he's always telling me how much he appreciates it.
I take him meals a few times a week, check to see if he wants anything from the store whenever I'm going, stuff like that.
When I go to visit him, or drop off meals, I take my dogs......he used to take care of them when we'd travel, back when he was in better shape, and he loves them like they're his own, so it always perks him up when they come running in with tails wagging all excited to see him. Sometimes all he wants is company -- unfortunately he spends too many hours alone, which I think is the case with many older people (and he has plenty of family in the area but that's another story).