We have airline tickets to leave for Zurich in a week and are planning to spend 9 days touring Switzerland ourselves. At first, we were going to rent a car then we thought about a swiss pass and taking the train. Now I'm concerned about altitude sickness and hiking in the mountains. We are 58 and 60yrs. old. Should we be concerned? I don't see any mention of this in Rick Steves or Frommer's books on Switzerland. Any advice would be deeply appreciated. Thank you!
Michele from Pa