Halflings

Hillfolk
Follow the Lightfoot halfling subrace plus the following:

Brave Traveler. You are immune to being Frightened.

Surefoot. You have advantage on all Dexterity saves vs. falling prone.

Riverfolk
Follow the Stout halfling subrace plus the following:

River rat. You can always detect whether water is safe to drink or not.

Well wisher. You have advantage on checks to locate water sources.