I am puzzled by a few of your comments:
<<"Day 1 - Land at Zurich at 2.10 pm and travel to Radisson Blu Lucerne. Check in and go around the town. Overnight at Lucerne ">>
Good idea to go to Luzern directly.
The Radisson is certainly close to the station...very convenient and a surely very nice hotel.
However, for a more Swiss feeling, I always choose to stay in the Old Town. Not so much of a city ambience, and stunning views of Pilatus on a clear day. There is a whole row of hotels on Unter der Egg, a street which is a continuation of the Rathausquai which runs right along the river. Nice terrace restaurants along the quai.
map.search.ch/Luzern,U nter-der-Egg?pos=666179,211501&z=51 2
The restaurant Schiff is one that I enjoy...no longer a hotel, but there are apartments there.
This site recommends several hotels with a wide range of prices:
This is included:
www.hotelscombined.com /Hotel/Hotel_Des_Alpes _Lucerne.htm
I have stayed there a few times. Riverfront rooms are very nice. Great views. Friendly and helpful staff. Restaurant is not so special.
But the Rathaus Braürei restaurant is practically next door. My favorite for a range of menus and prices. Not Romantic. Gemütlich. By the way , das Rathaus translates as "the townhall."
If you want romantic, excellent and quite expensive, consider the Palace. Usually the best kitchen in Luzern.
<<"Day 4 - Golden Pass Line with return to Wengen (would this be hectic?) Overnight at Wengen">>
This confusing. Why would you do a round trip and return to Luzern, if you ar going to stay in Wengen?
<<"Day 8 - Zermatt to Zurich (best route?) Check in at Zurich and Rhine
Falls with museums sight seeing in Zurich. Overnight at Zurich">>
<<"How to plan for Glacier Express trip to fully utilize?
Best route to Zurich from Zermatt">>
Either you take the Glacier Express or you take the best route.
There are some options for shortest or a bit longer routes...fastest is about 3 to 3 1/2 hours. The Glacier Express is much longer, and finishes at Chur. From Chur to Zürich takes an additional hour and 15 to hour and 30 minutes.
Th etimetable will help you sort that out. It defaults to the faster routes:
The GEX departs at 0852 and arrives Chur at 1415and arrives Zürich at 1548. The next train to Zürich departs at 1416...a regional train, or at 1439 (easier connection, faster train, arrives 1553.
If you run fast at Zürich main station, hurry to the lockers, are lucky enough to find large ones if your bags are large, and dump your bags at the station, you might catch the 1607 to Neuhausen, Rheinfall, arrrive 1657.. More likely, the 1617, and still make it to the Rheinfall by 1713. Sunset is at 1859, so you would be able to see a bit and walk back to the station at dusk.
However, that is along day with a tough connection at Zürich, and you still have to retrieve your bags and go to the hotel.
Finally, many people...usually those who have seen other waterfalls, find the Rheinfall to be underwhelming. Flow will be lower than in the Spring. Still impressive, powerful, but not very high.
I find the high waterfalls in the Lauterbrunnen Valley near Wengen to be much more beautiful:
If you really want to see the Rheinfall, I'd recommend that you skip the Glacier Express, and go directly to Zürich from Zermatt by one of a few shorter routes, and get there nearer mid-day.