I have a bunch: the way Dakin's eyes squeeze into tiny crescents when he smiles big, the way he says 'Mommy,' the way he laughs and sneezes soundlessly. The way he loves silly things, and his little TV shows.
But one of my favorite favorite things is when he snuggles with me. It's usually when he's waking up from his nap, and I get to hold him against me, his face nestled as far in my neck as he can get it. If I move my head and he doesn't want me to, he'll stretch his little neck as far as he can to tell me to bring my head back, so his face is completely hidden. He likes to push away sometimes, sitting balanced on my knee, and look around laughing, but he'll usually come back for more snuggles.
He'll also occasionally (and on purpose! Agh!) slam his head into my collarbone, which is indescribeably painful for me, but he just laughs about it.
Anyway. Snuggle time is one of my favorite times of day. Just thought I'd share.