So, castle or farm? You can't just handwave this question away so easily! Would you hire people to take care of the castle or farm for you? I hear both are quite a lot of work! How exactly would you be spending your time, apart from making music?
aside from the farm likely taking up all my time (for however long i'm able to sustain that), pursue all my interests: exercise, language, reading, writing, watching movies/tv, taking photos, making films, lifting weights, kayaking, hiking, rock climbing, cooking/baking, biking, playing video games, drawing, spending time with loved ones, studying, the list is endless.