The Charm of Yuriko's Keepsake is a minor Ranged charm in Ghost of Tsushima. Each arrow has a 15% chance to poison its target. You get it by finishing The Proud Do Not Endure or The Art of Seeing.
Any of these tales gives it as a reward: The Proud Do Not Endure, The Art of Seeing.
Bowman's Straw Hat
Bowman's Straw Hat is a straw hat favoured by archers. You get it by finishing "The Art of Seeing", the second of two Yuriko side tales.
Akashima Bamboo Strike
The Akashima Bamboo Strike is a sword-timing challenge near Fort Ito in Toyotama. Cut through all the bamboo with the right buttons and it counts toward raising your maximum Resolve.
Akashima Haiku
The Akashima Haiku is a poem spot where the river meets the sea, just south of Old Kanazawa Marsh in Toyotama. Sit down, pick three lines and you earn the Headband of Uncertainty.
Akashima Lighthouse
Akashima Lighthouse is one of the 10 lighthouses Jin can relight, at Fort Ito, Toyotama. Lighting the fire gives a minor boost to your Legend.