8 days with Swiss Travel Pass- Reservations?

Hey folks and experts,

I am traveling with my parents (Senior Citizens) to Switzerland and planning to follow the following itinerary from the 17th of July. Need someone to verify it and suggest changes if required. Also, have heard that the weather can be uncertain and we should be flexible, but wonder how can one reserve the tickets in advance and be flexible at the same time (especially for the 1day mountain excursions).

Day 1: Stockholm to Basel by flight (will reach around 2 pm).

Day 1: Basel to Luzern by train.

Day 1: Luzern to Rigi (may be on the same day as the arrival from Basel or a day later)- Boat to Vitznau, Cogwheel to Rigi Kulm and return via Weggis to Luzern. (Reservation not needed with Swiss Travel Pass)

Day 2 or 3: Luzern to Titlis peak. Train to Engelberg, Gondola to Trübsee, Gondola to Stand, Revolving cable car to Kleintitlis and finally Chairlift. Return via Engelberg to Luzern. (Reservation for Titlis Valley station up to the last point on Titlis can be done at the valley station with 50% discount for STP, excluding for the chairlift which costs 12 Franks, I guess)

Day 2 or 3: Pilatus (maybe). Train to Alpnachstad, Cogwheel to Pilatus. Return via Fräkmüntegg-Kriens to Luzern. (50% discount on the reservation with STP, has to be done at Alpnachstad station- no e-ticket or print@home facility)

Day 4: Morning Luzern to “Chur by train and taking Glacier Express from Chur to reach Zermatt” or taking the Göschenen-Andermatt-Zermatt route (stay at Zermatt, at night). Please suggest! considering scenic views and travel time for the elderly. Glacier Express reservation can be done online (print@home), Cogwheel from Göschenen to Andermatt, not sure how to do the reservation for this Cogwheel train?.

Day 5: Zermatt to The Gornergrat by Cogwheel. Reservation can be done online (print@home). The very same day, in the evening, travel to Interlaken via Speiz by train for which reservation is not needed with STP.

Day 6 or 7: Interlaken to The Jungfraujoch: Interlaken to Kleine Scheidegg via Lauterbrunnen, Kleine Scheidegg to Jungfraujoch-return and then Kleine Scheidegg via Grindelwald to Interlaken. Reservation can be done online (print@home).

Day 6 or 7: Schilthorn (maybe). Interlaken to Lauterbrunnen by train, then bus to ‘Stechelberg Schilthornbahn’ and by cable car to Gimmelwald and to Mürren. Finally from Mürren to Birg and to Schilthorn peak by cable car. Reservation is not needed with STP.

Day 8: Interlaken to Geneva via Golden Pass line. Free with STP. Interlaken Ost to Zweisimmen by train and Zweisimmen and Montreux by Golden Pass Classic or Panoramic (how to differentiate this on the timetable) Reservation not compulsory but recommended. Need to know various Boat options (time and reservation possibilities) to Chillion castle and then to Geneva so as to check in around 7 pm at the hotel in Geneva.

Regards,

Darshan