If you'll be spending all or most of your time in or along two cities, another possibility (though not specifically aimed at tourists) is the Point-to-Point card, which is a weekly/monthly/yearly pass for just a particular stretch between two cities. It also includes some travel on public transit in each of these cities; you'll need to find out the details for the cities you're considering.

My wife and I purchased these for the Bern-Fribourg route during a 15-day trip where we stayed in a city along the route. I think the price at the time averaged to about 15 CHF per person per day, and we avoided the hassle of buying train tickets; we could just hop on any train and go to Bern, Fribourg, or anywhere in between.

If you'll be spending all or most of your time in or along two cities, another possibility (though not specifically aimed at tourists) is the Point-to-Point card, which is a weekly/monthly/yearly pass for just a particular stretch between two cities. It also includes some travel on public transit in each of these cities; you'll need to find out the details for the cities you're considering.

My wife and I purchased these for the Bern-Fribourg route during a 15-day trip where we stayed in a city along the route. I think the price at the time averaged to about 15 CHF per person per day, and we avoided the hassle of buying train tickets; we could just hop on any train and go to Bern, Fribourg, or anywhere in between. In Bern and Fribourg, any form of public transit was included in the ticket.