I love this thread! I always roleplay in farming/settling games (that includes Skyrim btw). I want to build a happy, well-stocked, safe cozy house for my character. I don't play as mini-me, for some reason my characters are almost always guys (I'm a woman), and I guess they are a way for me to experience all the things I can't in real life: growing things, fending off dangers on my own, making my own cheese, rearing animals, making poisons, exploring, having a successful and well-designed homestead...
In SDV, my questing is now done and I can focus on the roleplay. I plant lots and lots of crops, because my farm is going to need to stock up on wheat, corn, rice, sugar, oil, cabbage, kale, potatoes, yams, peppers, tomatoes, milk and eggs, fish products... I process the foods, because of course I need to preserve my kale, it would spoil before next year, and milk needs to be made into cheese to survive the winter. I'm cooking foods I don't need just because they would be great to make in real life (all the spicy foods I can't eat in RL, all the cakes, desserts, puddings and so on...) I make beer, ale, wine of different kinds, juices, jellies and preserves, not just for my own pantry, but because they should sell well -- tourists are always going to want to buy beer even if they aren't so sure about kale!
My greenhouse is full of beautiful fruit trees and bushes of ancient fruit, and is the prettiest place on the farm, a place to warm up and relax on a cold winter evening.
I'm growing my own coffee and tea, and brewing espresso everyday. I grow flowers for my bees, and collect maple syrup for my breakfast. I go foraging for mushrooms and berries (something I love IRL but can't do anymore), and clean up weeds and trash from the community grounds just because it's a decent and right thing to do.
My farmer guy's backstory isn't a very involved one, he's just a slightly reclusive, burnt-out ex-corporate drone whose only choice was either to completely turn his life around or die in a life he hated. He's trying to be nice to his neighbors even when they aren't nice to him, he loves giving people gifts but is always very worried they are going to hate it, he's not going to marry - he's so happy with the absolute quiet and detachment of his little farm.