It will let you go to the main farm at your house and I think maybe Eda's field but that's it. You can trade stuff before entering someone's farm and they can increase the quality of crops on your main farm, so that's good at least~ My brother married Licorice but for some reason when I visited his house she wasn't there at all??? idk it might be because I haven't even unlocked her in my own save file yet
I don't have any Topaz at the moment sadly, I sold a lot of stuff because I'm still poor (like 44,000G)
I'm saving up for the 100,000G rucksack upgrade at the General Store but ahhhhh it's so expensive
Luckily I do have tons of tomatoes about to be harvested though so I'm gonna finally have some more money xD
So far one of the most recent things I unlocked was another shop other than Silk Country at the Trading Depot