Feb 18, 2017 - 4:39 PM
Perhaps there was a temporary problem, but I just tried the timetable and it works fine now. It also shows prices. You can compare passes as explained here. If you mostly travel short distances the Swiss Half Fare Card might be your best option.
Of course you can change base, but with only a week I wouldn't because I'd loose half a day just for the change. I can't help. I think there's a camping in Grindelwald as well but I don't know much about it.