May 31, 2016 - 10:20 AM
Welcome to MySwissAlps Zeb!
I agree you have listed more than you can do, but it's good to have some options and pick trips based on the weather and your energy level of the day. If you can't go to Jungfraujoch, you may want to consider the ride to Kleine Scheidegg so you can at least have a good look of the mountain.
As for the first afternoon: if the weather's good you can easily walk to the Harder Kulm funicular and go up. If it rains or too cloudy to go up, the Trümmelbach Falls are a good option. Take a train to Lauterbrunnen, then by bus to the falls.
If you plan to take a print at home pass to save time, please note that it takes a few days to receive it through e-mail, so you would need to arrange for that today. As you live in Ireland you can check either www.swisstravelsystem. co.uk or www.swissrailways.com/ en.