Hello
Welcome to MySwissAlps
You will need to get out a very good map of Switzerland.
I have managed to locate your hotel. I see that it is in Haute-Nendaz, right next to the Poste, which is also the main bus stop for the village!
The 362 bus runs at least once an hour to/from Sion, and the journey takes about 35 minutes. Sion is the ‘capital’ of Valais Canton. All your excursions (except those on local Nendaz cable cars) are going to start and finish with a ride on the 362.
Excursions not Recommended
The Bernina Express is not possible from Valais Canton: https://www.myswissalps.com/activity/bernina-express/
The Lindt chocolate factory is in Zurich. Zurich is about two-and-a-half hours from Sion, going via Visp and Bern.
Excursions which can be recommended.
I could go on for hours. Many of these are rides on (very scenic) rural bus routes,
From Sion bus up to Crans-sur-Sierre
From Sion bus southwards up the Val d’Herens.
From Leuk bus up to Leukerbad.
From Sierre bus southwards up the Val d’Anniviers
From Visp bus southwards to the stunningly beautiful Saas Fee: https://www.myswissalps.com/town/saas-fee/
And/or take the train from Visp to Zermatt: https://www.myswissalps.com/town/zermatt/
From Martigny, train to Le Chable, then cable car up to Verbier.
From Brig, train to Fiesch, then cable car to Eggishorn: https://www.myswissalps.com/activity/eggishorn/
What public transport pass are you investing in? Half Fare Card: https://www.myswissalps.com/travel-ticket/swiss-half-fare-card/? Swiss Travel Pass: https://www.myswissalps.com/travel-ticket/swiss-travel-pass/?
You need to get familiar the Swiss electronic timetable http://www.sbb.ch: https://www.myswissalps.com/travel/train/timetable/
Kind regards
Roger