<<"Thank you all for your timely responses. ">>
You are quite welcome.
<<"And yes we have seen Niagara Falls and it was a lot of fun.">>
Here is my opinion.
Others may disagree.
If you have seen Niagara Falls, especially the Canadian Falls, the Rhine Falls are a non-event.
Powerful, but not nearly has high or as large. You can get fairly close on foot, if I recall correctly. It has been quite few years since I was there. For what it is worth, my opinion is that I'd not make them a high priority
<<"We are leaving end of June and we are coming from Canada (EasternTime Zone). -Our intention is to do a lot of hiking and walking around. Our favoritetypes of trails are more on the intermediate side that has good views.(Nothing too dangerous or slippery conditions).">>
For jet-lag recovery purposes, you can consider Luzern and Zürich to be pretty much equivalent. Take a look at the time table...15-20 minutes to Zürich Main Station on 5 to 10 trans per hour; 45 minutes or more onward to Luzern., at least twice per hour.
Twice an hour from the airport to Luzern.. The ones at XX47 take 1 hour 2 minutes and have no change at Zürich main station. The ones at xx18 require a change at Zürich main station. Since you would come in on track 32, and go ut on track 8, the connection requires a small amount of escalators (or an elevator - is that a lift in Canadian English?) and walking, but luggage carts are readily available and they go up and down escalators . The one at the airport are free.
The ones at Zürich Main station have a coin-in-a-slot process which gives you back your coin when you are done, but you'd better have 2 CHF coin or two in your pocket. They take some kind of Euro coin, too.
July is a good time for the most of the high Alps. Early June is bad, mid-June is iffy, late June is good for the high trails, generally. July and August are best for the highest trails, into September.
I have a trail list that I find helpful on my other computer that I find helpful. Will post it later.
Meanwhile take a look at this report.
That should get you going, I think.
PS - I don't do rail discount options. Arno and Annika are the experts.