did a tour of the grimsel, susten and furka a year or two ago whilst having a weeks holiday based in interlaken. not on the bike, but in a honda s2000. it was awesome. i would highly recommend a holiday there to anybody as it's so beautiful and there's lots to do.
in the week we went up to the highest train station in europe on a glacier at the top of the jungfrau which passes through the eiger on the way up and you get to get out and look through windows on the north face. also went paragliding and had a boat trip, as well as plenty of driving of the mountain passes. one of the best holidays of my life.