Two weeks in Wengen

Hi Philip, and welcome! I don't think you'll get bored during a two weeks stay in Wengen. It's a lovely village with stunning views, lots of hiking possibilities, mountain trains and cable cars, and so on. So if the offer of the Bernerhof hotel in Wengen is an economical option, I think you should go for it. Our day trip and hiking overview may help you prepare for your holidays. I don't have personal experience with the hotel you mention, but you'll find lots of reviews on the internet. And maybe other forum visitors know this hotel?

Yes, a rail pass will definitely come in handy if you make use of public transport on some of the days. You could consider the following options:
- a Swiss Half Fare Card, which offers a 50% discounts on lots of trips in Switzerland. The Swiss Half Fare Card costs CHF 110.00, and only a few rides in expensive mountain trains or cable cars will make it cost effective. As the pass is valid throughout the entire country, it's especially suitable if you consider to leave the immediate region a few times. You may want to do so to explore a bit more than just the Wengen region, or if weather is bad there but nice in other areas;
- a Regional-Pass Bernese Oberland may be the right choice if you plan to stay within the Bernese Oberland mainly, and if want to make extensive use of public transport during a few days (for example when making a round trip by public transport). The Regional-Pass offers a few days of free travelling and a few days with discounts. Please check the current regional pass offer to see if that's interesting to you.