The opening scene the entire way through. I was crying so hard I had to cover my mouth with my jacket just to not make a lot of sounds.
The scene when he goes through the notebook for the first time brought back the tears.
The scene near the end of the movie when he finally reaches the spot, opens up the notebook that the whole movie he thought was empty, only to see that the whole time she was filling it with images of the life they shared, he was her adventure.
The final scene when they show that the house landed exactly like it was in the pasted image once again, to be forever.