Far side lunar landing in RP-0. Tsiolkovskiy, large lunar impact crater located on the far side of the Moon was considered as a potential target for Apollo 17 mission. Due to a different geology landing on the far side could have returned significantly more scientific value than an additional mission to the near side. NASA however vetoed this idea as too risky, and Apollo 17 instead landed in the Taurus–Littrow valley on December 11, 1972.
Mod list: http://i.imgur.com/c8pxnY7.jpg