Apr 20, 2017 - 9:13 AM
in reply to lisaO
here is the boat schedule for the Brienzersee (Lake Brienz.)
See page 7.
Look carefully at the red letter coding for which service is available on which day.
Although the entire schedule on the Thunersee changes part way through May, on the Brienzersee, some of the the service starts in April and has the same schedule through the 30th of June. Not all. The last boat from IO to Brienz is at 1607, but that service only starts on May 13th.. The last boat with some kind of restaurant service is at 1407 and it is routinely a steam powered paddlewheeler. I cannot figure out definitely from the schedule on what date that service begins. Probably May 20th, but i'd ask them or a tourist office.
As Lucas noted, there is a fair amount of time required in transit for your desired destinations. If all you want to do is go to each place and step off the train or cablecar, then step back on, you still would have trouble making the 1407.
To be sure, use the timetable and work out exact connections. It should be possible to catch the 1607, but don't plan on taking much time to explore or enjoy either of the mountains. I agree with Lucas...you are trying to do too much to fully enjoy the experiences.
If you wish to spend more time in the mountains, consider staying in Wengen or Lauterbrunnen, instead of interlaken. Remember that May is the tail end of Winter at high altitudes, and the "low" season. Some restaurants and hotels near the Jungfrau only opening for the Summer in early to mid june, after closing for a break sometime in April when the skiing conditions deteriorate. The transport to the Jungfraujoch and Schilthorn will be running.