Two week trip. 15 day Swiss Travel Pass first class. Oldish couple but fairly active. Long report mostly so I can remember it all myself. We didn't really have a definite itinerary just a long list of things to fit in as many was we could as and when time and inclination allowed.
More of my thoughts on the STP option at https://community.ricksteves.com/travel-forum/switzerland/swiss-travel-pass-thoughts
Day 1 - Sunday. Zurich and Lucerne
Arrived ZRH about 8am. 45 minutes to shuffle through the terminal and get the bus to immigration and another 45 to clear EES. But we were ready for it and had no immediate onward travel. Took the short trip to downtown Zurich and stashed luggage in the lockers (they are big enough for a carry on and a medium rucksack in each). Only a few were not already in use.
Short walk to the Lindenhof park overlook and then down by the river. Bridges had a lot of construction so best views were across not along. Then to Burklipkatz and a very pleasant 90 minute lake cruise. I don't think the Zurich boats had first class but we were able to grab an inside table and the first of our many boat trip partakings of beer/cocktails/fries/ice cream or some combination thereof hit the spot after our journey. Then a passing tram to the short Polybahn funicular for more views. Not over exciting but it only takes a minute or two to the top so worth doing.
Early afternoon train to Lucerne and the short journey to Hergiswil where the Hotel Roggerli is at the top of an off road path where Google Earth does not do justice to the true gradient. Definitely took the long route down with luggage when we left although we braved it again each day for the train. Hotel / lake view and our balcony were all great and trains to Lucerne are every 15 min.
Some (not many) boats stop at Hergiswil and we took one for the short journey back to Lucerne a good way to get a first real view. Walked round the usual (busy) covered bridges etc and a bit on the city walls although the latter not ideal if you have bad knees and bad balance. Lots of steep steps. Then the funicular up to Chateau Gutsch (it is just an elevator really - you call it with a button and operate it yourself). Nice views from the terrace and the bar.