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Hello Shonelle and Welcome to MySwissAlps,
No easy answer.
A clearly mapped out itinerary will provide you with the basis for deciding which pass (if any) suits.
Using your itinerary you need to do the sums based on the cost of all your planned trips on trains, boats, cable cars etc. You can find the fares for any trip using the SBB Timetable (http://www.myswissalps.com/ti metable). If you are not familiar with the timetable it will pay to first read the instructions on that page.
When you go to buy a ticket the fare you see on the right hand side of the page will normally be the half-fare price. Double it to get full fare. With A Swiss Travel Pass it is free provided it is shown as free on the Area of Validity map ( PDF downloadable from http://www.myswissalps.com/sw isstravelpass/validity).
You should read “How to choose the best travel pass” (http://www.myswissalps.com/tr ain/ticketspasses/prac tical/chooserailpass), download the handy spreadsheet calculator and do the math.
Irrespective of which form of ticket or pass you get you will also need to purchase reservations for the Glacier Express.