Historic hilltop complex with sweeping city views; in winter the grounds are atmospheric and the castle interior (open ~9:00am–4:00pm) is worth touring.
Seasonal scenic options include short boat rides or the Romancecar-style train view (check operation in December); splendid views for a couple's outing.
Zermatt offers extensive slopes and guided winter hikes; lifts generally operate ~8:30am–4:30pm in winter but check daily schedules and snow conditions.