there is no hearthstone set point there, there is a hearthstone type toy that would have to been obtained by a higher level with 4 other players to get it
lorewalking mode (new to this years event) did not affect the scaling/scale down mobs, could not loot chests and other items
Isn't Pilgrim's Grace not far from where the port lets you off? I haven't looked this year, but I know for a fact I bound a toon's hearth there last year.
No idea what all you can do out in ZM as a 20, but at least setting your hearth and wandering around should be fully possible.