One place to start would by the Fate Story survey. Every year rahv7 runs a survey among the player base for our opinions on various Fate-locked pieces of content. Most recent survey resutls.
Regarding locations specifically, I think the main ones are Mangrove College (Mushroom’s Dream) and Tanah-Chook (All Things Must End), both of which are overzee. Murshroom’s Dream also gives an item, which is a functional duplicate of an item from Whitsun but pretty good if you don’t already have it.