I am re-reading Book 3 for the first time and just started. It gets off to a quick start with the three horns being blown in the prologue as the white walkers approach the Fist, Brienne using the boulder to crush the ship so she and Jaime can escape, etc.
But the coolest part for me (because i had totally forgotten this part) is when Arya, Gendry and Hot Pie are running away from Harrenhall and the bloody mummers. When Arya finally sleeps, she has a wolf dream where she wargs into Nymeria who is on the prowl in that area with her pack, and Nymeria and her pack (with Arya seeing it in her dreams) hunt down the four bloody mummers they sent chasing after Arya and tear them to pieces with the final part being Nymeria ripping the whole arm of one of them and shaking it in her mouth. I can't believe I forgot that Arya warged Nymeria in her sleep and Nymeria helped them escape. Cool bonus scene for me.
There is just so much stuff in these books, it is amazing how much I forgot or glossed over the first time through. These books make for great re-reads.