My mom is blind too and similar to your grandfather, it has been a slow transition. I got my mom a stationary bike for Christmas that she enjoys going on sometimes for some exercise.
As far as technology I got her an iPad but she's been having a lot of difficulty adjusting to not having any buttons she can physically feel :/ I know a lot of blind people really love using their iPad though. She has a computer with Jaws software which she prefers going on but she gets frustrated with that sometimes as well (she used to be a typing teacher many years ago so having to re-learn everything has been a little difficult for her). Just keep in mind that it's very normal and expected for them to get frustrated having to re-learn how to do things but it's important that they stick with it and keep practicing!!
She also has a victor recorder and Apple TV and both of which I would highly recommend.