Activity: out of the blue walk up to her and hug her and tell her how glad you are to have her in your life (make it a nice long hug)
I did a slight variation on this one. While we were laying in bed about to go to sleep I rolled over and put my arm around her. I whispered how lucky I was to have her in my life. She was like "AWWWEEE!!!"
Feel free to vary these slightly to fit your needs or situation. It didn't work out in our busy day for me to walk up to her and hug her. But I was still able to do the activity in my own way. Or if you can't or don't want to do that one that day pick another one from the list or come up with your very own activity. but try to do something every day.