Southwest of Zurich and south of Interlaken in the Jungfrau, there are 12km of langlaufloipe cross-country skiing trails in the Lauterbrunnen valley that run from the town of Lauterbrunnen to Stechelberg.
In addition, the town of Grindelwald has 17 km of langlaufloipe cross-country skiing trails. The trails are on the south side of town. The Langlauf Grindelwald - Grund trails consist of the Piste Blau route which is 9.5km and the Piste Rot route which is 7.5km.
If you are looking for a rowdy, Austria-style apres ski scene, this is not the place. Honestly, there really is not any apres ski scene. The best you'll find is in one of the towns away from the lifts. In Grindelwald, you will find some people celebrating the days runs at the Avacado Bar and at the Espresso Bar. If you are looking for some nightlife, plan to stay up late since the action starts after 11pm, especially at the Espresso Bar or the Mescalero Disco which are both at Hotel Spinne.
To reach this area by train, plan to take one of the many international connections to Interlaken Ost, which is southwest of Zurich or southeast of Bern. From Interlaken Ost, transfer to the local Berner Oberland Bahn railway, which serves both Grindelwald and Lauterbrunnen. Once in either of those towns, there are a variety of Post Buses, trams and cog railways to get you to your final destination.