<<"Day 4 Visit First village in morning and take some hiking trips; First to Grosse Scheidegg or First to BachseeDay 5 visit Lauterbrunnen valley and walk upto Stechelberg,see Trümmelbach Falls and then to Schilthorn.">>
<<"Is the activities on day 4 and 5 can be done on a single day..so i can spend a day in other part of interlaken..as suggested.">>
I have not tried to put those together in a single day. It would be difficult. I'm guessing it is possible with an early start, however, you'll use up a lot of time on travel in from Interlaken and back out. Also - going from the Grindelwald/First area in one branch of the valley to the Stechelberg/ Lauterbrunnen area in the other branch of the valley takes time. You have to get between them.
The SBB timetable ( link given below) says it takes 1 hour and 41 minutes to get from First to Stechelberg, twice per hour at xx11 or xx41, using 5 stages of public transport, via Zweilütschinen.
Here are things you should know and some ways to get the data you would need to decide if it is possible to fit all that in a single day.
1.- What time is the first and last lift, bus, cable car, cograil train or what have you, up to and down from the destinations.
I'd spend some time laying out the whole journey. Here is a link to the SBB time table which provides schedules for all trains, boats, cable cars (lifts) in Switzerland:
I give that link rather than the one in the forum, because the one in the forum does not have a "via" box until after you get into it.
How much time will you spend on the walk?
Here is a link to the First to Bachalp See walk - 2 hours and 30 minutes.
How often does the connecting public transport run? Some run continuously ( lift from Grindelwald Grund to Männlichen), others every half hour ( some trains) or every twenty minutes ( some cable cars - Luftseilbahnen.). What happens if you finish your walk 5 minutes after a cable car leaves and you have to wait 25 minutes ....more than once.....
First to Grosse Scheidegg- 1 hour 30 minutes -
On the Lauterbrunnen Valley portion, you could ride the bus part or all of the way between Lauterbrunnen and Stechelberg.
I was there last week and noted that the lifts up from Stechelberg to Gimmelwald to Mürren and on up to Schilthorn are coordinated, so that you get off of one and onto the next with little delay.
Everyone has their own preferences, but, if I were doing it, I'd choose to spend more time in the Jungfrau proximity and less in Interlaken. Interlaken is a nice town, but you really experience the mountains when you are in Wengen, Grindelwald, Kleine Scheidegg, Mürren, etc.
<<"Can you please suggest some light activities near Lausanne on final day ...before departing to paris.">>
Lausanne is on a hillside. If you want some exercise, walk up and down the hillside. ;-)
1.- You could take the train ( funicular. maybe?) down to Ouchy and walk along the lake shore, in the direction toward Vevey and Montreux. (to the East.). Plenty of places to eat, good trail/road. Obviously, you would only go partway along it.
2.- It will be a little early for the vineyards to look their best - I like them in the fall when the golden and yellow tones have replaced the green of the leaves - but a nice train ride through the vineyards goes from Vevey to Puidoux-Chexbres Gare. The views over Lake Geneva, and over the vineyards near Lausanne (the Cote Lavaux) are really very nice. In the late afternoon, the sunshine makes them glow. (You may have to leave too early for that.)
Either end of the short ride is reachable by train from Lausanne. Puidoux-Chexbres is a small local stop, so I'd look carefully at the schedules for that station. Vevey is on the mainline.
You can do a circular route or an out and back route..
3.- www.myswitzerland.com/ en-us/lausanne.html