Upload & Sell: On
You did pretty well for the conditions that you had to work with. Mike has already given you great suggestions if you are able to get back there, or if you are presented with a similar situation in another location in the future.
My suggestion for shots like these that you have no alternative as to the time of the shot, blending then becomes your friend. You take the two shots you mentioned as to one being too bright and one being too dark, and just blend them. One other thing, if you are using ACR to process your raw shots, it's getting very good at getting detail out of darker shadows with still good detail. So if you had to try just one shot to work from, I would go with one where the highlights were just slightly blown, pull the Highlight and White sliders all the way to -100 to recover the highlights, and then pull the shadow detail to 100. See what you get.