We have spent many Summer holidays walking in the Alps. I am now 87 and my wife is 84. We want to go to Wengen this year but our walking prowess is now very limited. We shall take the opportunity to re-explore the area but would like to think that we could just walk out of the hotel and go for a walk of say around three miles on reasonable paths and without encountering too many steepish hills so that we can enjoy the magnificent scenery. Are we expecting too much? Glad to have any comments. Hoppies.">>
I always joke with my friends in the USA that a level walk in Switzerland may be inclined at up to 30 degrees...upward or downward.
The very best example of what you seek the walk from Männlichen to Kleine Scheidegg, where you can catch the train back to Wengen. To get from Wengen to Männlichen, step out the door of your hotel, walk a few paces ( if you stay at the Hotel Schoenegg, at least) or a few more paces from other hotels to the gondola lift, and ride it up to Männlichen.
I believe that the moderators can point you to some other easy trails that meet your criteria, but you might have use public transport to get to the start and finish.
The trail I mention is at about 22oo meters,and will likely not be snow free until sometime around or after mid-June.