Nice to hear you want to visit our country. Autumn is a great time here, and the best for hiking excursions. The views, in terms of visibility, from mountain tops will be excellent, much better than in June or during summer.
Kindly note, the tourist ticket is named Swiss Travel Pass (SwissPass is a resident kind of product).
That said, you could, for instance, combine multiple Swiss Travel Passes. That’s absolutely fine.
Or, if you aren’t into museums that much (since the STP includes the museum pass as well), you could buy the Swiss Half Fare Card and single tickets, including Saver Day Passes. The Swiss Half Fare Card is worth if you spend more than 240 CHF on travel tickets per person.
Or, depending on your itinerary, and your bases, there are multiple regional passes available, such as the Tell Pass, the Berner Oberland Regional Pass, the Jungfrau Pass, the Top of Europe Pass, and so on.
Or, there is the 1 month GA card which also offers unrestricted travel on public transportation, and has the same range of validity as the Swiss Travel Pass. It does not include museums, however.
As you can see, there ate too many options and offers.
To conclude a personal advice, if you allow: from a planning perspective I suggest you to firstly draft your itinerary and to only decide on tickets as one of the last steps of the entire planning process.
Where to get useful help on planning your trip? The TripAdvisor travel forum Switzerland is moderated by many experienced and local destination experts. Also myswissalps.com is a good web resource to ask questions about travelling in Switzerland. Both platforms can help you draft your itinerary and can answer questions that go beyond public transportation tickets.
Come back here if you need more help concerning public transportation. Here we are the experts for trains, buses, trams, cableways, and mountain railways.