Since they are committed to scenic hikes in Switzerland, this might help.
There are nice trails from Lauterbrunnen along the river going up the valley toward Stechelberg and down toward Interlaken. If it’s too snowy or cold in the upper trails, these would be an option. From Lauterbrunnen, they can get to Wengen or Murren to do hikes at higher levels although the funicular, cable cars, etc. may be closed for maintenance in late October.
They may consider the Niederhorn region, which is reachable from Thun or Interlaken. From either, you can take a bus to Beatenbucht; then a funicular to Beatenberg, and a cable car to Niederhorn. There are nice hikes from there that are lower than the high Alps hikes and that offer great views of the Alps and Lake Thun. I hiked from Niederhorn to Gemmenalphorn and back (a great half day hike) and saw an ibix.
Currently, the trails are still open there.
Here are links to other discussions and trail descriptions.
For the Gimmelwald side, this site has a few maps and a number of hikes, plus other information for visitors.
This describes hikes on both sides of the valley:
Here are some older posts with lots of suggestions about hikes and hiking guides.
Jungfrau Eiger Walk
The two and a half kilometres long, well-developed trail from the Eiger glacier station to Kleine Scheidegg (or vice versa) is also well-suited for inexperienced hikers (Currently Open).
All the best,