There are shops at the beginning with some tasty treats, but we did not see anyone offering to be guides, so not sure we got out of this experience all that we could have. I had done some advance research, which was helpful. It is not easy walking in the salt mines, so if you have small children or poor balance, I'm not sure how far in I would venture. I had read varying accounts of how to get to this place; in the end, the driver took us right to the entrance and you don't have to walk far at all; I had thought we might have to walk up to an hour (which would not have been worth it). We went in the morning, it was certainly interesting to see, but had elsewhere read to go in the afternoon for fabulous colors. This place is "off the beaten track", driving on dirt roads to get there. It was interesting to walk into the site and see the different stages of work going on, and by the far side looking back, it looked like an iced bundt cake!
We hired a taxi for the day and had him drive us around the Sacred Valley; as the buses all follow the same schedule, this meant we were able to go to sites when the buses weren't there. It was awesome to be able to do this (we had many sites practically to ourselves), we spent as much or as little time as we wanted at each place, and had no "forced" shopping experiences that others told us about. Highly recommend this approach (it cost more than bus tickets, but I'm sure we saved money in the markets!!!). The taxi was also able to drop us off at one end of a site and pick us up at another spot, so we didn't have to backtrack.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.