I went up the ropeway which was included in a Mount Fuji tour and was ok but nothing special. It takes 3 minutes to get to the top. When I was there the weather was horrendous with rain and low cloud which made it pretty pointless. You could just see the lake below but little else so unless the weather is clear don't bother with it. There is nothing at the top apart from a small cafe/shop and a little shrine.