A bottle of wine, a hot shower, a burning fire, peace and quiet, snuggles with the SO.
“I made you take time to look at what I saw and when you took time to really notice my flower, you hung all your associations with flowers on my flower and you write about my flower as if I think and see what you think and see—and I don't.”
― Georgia O'Keeffe
My mom's an ISFJ. I think if someone took away her cooking responsibilities and the subsequent dishes...basically help them finish their workload faster so they can sit down without worrying about not having done stuff, that would be awesome.
Get them a token that symbolizes a fond memory or inside joke between the two of you. Or maybe something that they pointed out in the shops, and said they liked it. My ex of an ISFJ appreciated it when I paid attention, especially when she knows I'm not the most observant person.