Mike-
Once you get above Wengen or Grindelwald, you are going to have to spend some money on transport, unless you like 800-1000 meter climbs up to 2000 or more meters before you start the point-to- point hike. The transportation up there is privately owned, and expensive to keep running.
www.myswissalps.com/be rneseoberland
and
www.myswissalps.com/ju ngfrauregion
This give schedules:
www.myswissalps.com/ti metable
As you focus in on various routes, come back and explore costs further. There may be a benefit to getting some form of reduced fare pass, as a supplement to your Eurail pass.I don't know what your Eurail pass covers in the Jungfrau Region.
Arno and Annika, the forum moderators, are the resource for that information.
A trivially easy hike, but with some of the best views in Switzerland, runs from Männlichen to Kleine Scheidegg. It far outclasses the Eiger trail, in my view. Much better in the stated direction, going toward KS and the Eiger.
Take a look at these links.
www.myswissalps.com/hi king
www.myswissalps.com/fo rum/topic/tips-about-wengen-and-the-jungfrau-region-by-kim
You may want to consider Schynige Platte to First. Not an easy hike, but very rewarding
This following map is extremely powerful, but it takes work to learn all the options. One is to display hiking trails.
Home page and map links as follows -
www.swisstopo.admin.ch /internet/swisstopo/en /home.html
map.geo.admin.ch/?topic=swisstopo&lang=e n&bgLayer=ch.swisstopo .pixelkarte-farbe&layers=ch.swisst opo.zeitreihen,ch.bfs. gebaeude_wohnungs_regi ster,ch.bafu.wrz-wildruhezonen_portal,c h.swisstopo.swisstlm3d -wanderwege,ch.swisstop o.swissalti3d-reliefschattierung&lay ers_visibility=false,f alse,false,true,false& layers_timestamp=18641 231,,,,&X=164600.00&Y= 639960.00&zoom=5
and
map.geo.admin.ch/?topic=swisstopo&lang=e n&bgLayer=ch.swisstopo .pixelkarte-farbe&layers=ch.swisst opo.zeitreihen,ch.bfs. gebaeude_wohnungs_regi ster,ch.bafu.wrz-wildruhezonen_portal,c h.swisstopo.swisstlm3d -wanderwege,ch.swisstop o.swissalti3d-reliefschattierung&lay ers_visibility=false,f alse,false,true,false& layers_timestamp=18641 231,,,,&X=168160.00&Y= 640500.00&zoom=6
And, info about "die Wanderkarte," topo paper maps with marked trails (die Wanderwege).
www.swisstopo.admin.ch /internet/swisstopo/en /home/products/maps/na tional/25.html
Have fun planning. There is a lot of information available.
Slowpoke