The Lago Maggiore Express is a picturesque day trip you can do under your own steam. It includes train travel from Arona or Stresa to Domodossola, from where you get the charming Centovalli (Hundred Valleys) train to Locarno in Switzerland, before hopping on a ferry back to Stresa. Tickets are available from the Navigazione Lago Maggiore ticket booths at each port.

The two-day version is better value if you have the time.