When I looked up my date (September) it was about $260 for a full day. The bus tour I have was $230 for the pair of us, so I am sticking with that. It will be a bit more due to tipping but for a first time, I would like a guide.
I thought I might be bored on the train, since it is a round trip this year. If it was train up/bus down or the opposite, I would have been more interested.