I really like to suggest the train station when a mii says he's ready to pop the question to his sweetheart. It's the only way to visit the place. Even the way an unsuccessful proposal ends is special because a train comes to take the mii (being proposed to) away as the one left behind waves goodbye with heartbreaking disappointment on his face.

Quote of the Day from Geralt: "I try to pretend I'm asleep on the train so that no one tries to talk to me."