Of course all this planning could go right out the window if there is a lot of rain next week. But, keeping our fingers crossed. Days are not set in stone all based on weather.
Day 1 Arrival from NY . Train from ZRH to Grindelwald check into Chalet.
2nd day - Train to Wilderswil, cogwheel to Schynige Platte. 4 Mile Panorama hike.
3rd day - Cable car to First. Cliff walk, Hike to Bachalpsee. (depending on weather for views continue to Faulhorn). Return on Flower trail to either the First Flyer to mountain cart to trott bike back to Grindelwald. Or follow the flower trail down to Bort and pick up just the Trott bikes.
4th day - Train to Lauterbrunnen... Rent ebikes from Imboden Bikes to explore the valley, falls and take the bikes up to Murren in the morning. Afternoon. Cog train to Wengen then Royal ride up to Mannlichen. Walk to Klein Scheidegg (2.5 miles) and then train back to Grindelwald or Eiger Express.
5th day - Train to Kandersteg, Cable car up to Oeschinen Lake. Take the Oeschinensee Panorama Hike 5 miles.
6th day - Eiger Express to Eigerglstscher station then Jungfraujoch railway to the Top of Europe. Return Hike Eiger Trial (north face) 3.75 miles to Alpiglen and then train back to Grindelwald.
7th day - Free day. Canyoneering, Paragliding, whitewater rafting?
8th day - Check out early.. train to Lucerne. Golden roundtrip to Mount Pilatus morning... maybe Loop Tours Lucerne Cargo bike tours in the afternoon.
9th day - Day trip to Mt Rigi Train to Zurich.
10th day Train from ZRH to Konstanz. Boat ride down the Rhein stopping at Stein am Rhein and Schaffhausen. Train back from Schaffhausen to ZRH
11 day - Flight back to NY
Rainy Day: Trip to Bern,
Catch boat in interlaken to Thun ..Maybe St. Beatus Cave or Spiez Castle .
Boat on Lake Brienz Get off at Giessbach Waterfalls hike end in Brienz train to Aare gore.
Grindlewald Gorge, Sports Arena, Spa day?