I'd say about showing up at his door when he doesn't know you're on the way?
That would probably surprise him, and many people feel taken aback when they are surprised, and that might not help him experience a fresh wave of warm feelings.
In other words, i would not want to think of you standing on his doorstep feeling embarrassed and he doesn't know what to say.
Surprises are great if you're, like, buying your best co-worker gal friend a gift certificate for the new raw juice bar. I'd go for carrot if you were wondering.