We had originally planned to visit Chongqing to do the Yangtze river cruise, but ended up not having enough time but had already booked hostels.
We set off early in the morning as we had a flight to catch at 9pm that evening (Would not recommend doing this. Although we fine in the end we did constantly have that hanging over us for the entire day).
Buses leave from the main Chongqing bus station from about 7am onwards. The journey there took about 3 hours. Upon reaching Chongqing's old bus station, you have to go to the new bus station. Not too difficult, but make sure you have the Chinese for this written down. We took a rickshaw for Y5. Upon reaching the old bus station we then had to wait for another bus. This bus then drove us to another bus, and which finally took us up the moutain to Baodangshan. Once there, the bus parks near all the standard souvenir shops and from there its about a ten minute walk to the site (don't bother getting a shuttle or rickshaw).
Once there we paid Y170 (no student discount), which was by far the priciest attraction we did in China.
The carvings themselves were stunning. Carved entirely out of the rock face, and painted over the subsequent centuries they are really unique. Unfortunately the thousand had boddhavistta was being restored a the time we went. We managed to avoid most of the large local crowds as it was a weekday which definitely improved the visit. The forest setting was absolutely beautiful too.
I would only recommend doing this if you have time spare in Chongqing for any reason. Although they are truly amazing, the difficulty and time we spent getting there (along with the evening flight constantly hanging over us) kind of tainted it.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.