I am a pensioner travelling alone to Davos to meet up with friends at an apartment we have booked for 9 days in June. I arrive at Zurich airport from the uk. I would welcome advice on the most economical, suitable rail pass to get to Davos and back to the airport. I have looked at the different passes on Swiss rail and think probably the Transfer ticket at £75 might be best. I don't expect to venture far. I can buy a half fare card cheaper at £58 but do I have to pay extra on each trip I make?