You will not find too many nightclubs or hot bars in Lauterbrunnen. Best to pick a restaurant near your hotel, have a quiet meal, and then head off home to bed. Apres ski is best done up in Wengen or Murren. There is one disco in Lauterbrunnen, but it is lame on most nights, and even on Saturdays rarely gets going, unless you bring your own group to party with. The Stump Bar down at the campground can be fun some nights. However, it is also Club Schutzenbach, so you may feel like you are intruding on a private party some nights. Best to keep your energy for a busy day on the pistes.
The Horner pub, also know as Horny pub is were the locals and tourists come together. They play top40 music but also older rocksongs and sometimes also line-dance music and the locals start dancing right away all standing in line, its funny to see.
The staff is great !! especially Tina (a portuguese girl) and Helen (english girl)