Things to do with dad before he dies?

I would like some “creative” things to do with my dad in what could be his last weeks with us, he has a terminal illness, right now he is able to talk, walk, do most everything. I have thought of making a recording of him saying I love you for the ring tone on my phone, and for him to write something on my wrist that I can have a tattoo done, I want things to remind me that he will always be with me, and maybe some suggestions for the grandchildren ages 10–18, any help is soooo grateful!!