If someone could please tell me if this is to much to do in one day. I will be staying in Lauterbrunnen. I will take the train to Kleine Scheidegg and change into the train for the Jungfraujoch and would like to return to hotel on same day. Can i do that or am i pushing it. Also should I make reservations for the Jungfraujoch train before i go? Any help is appreciated.