Sweaty palms.
Well, not always. I have Large Hands, so the clammy but dreaded palm-sweat is avoided when merely my thumb is held.
That covers things as far as tactile sensation is concerned - what I feel. Internally, I want to play piano on them. I want to coax music out of their strings and bellows with fine manual dexterity. Trills, occasional grace notes, but mostly and finally a comfortable fermata.