According to the Kennedy Space Center, the mission objective was as follows :
"The lunar landing site was the Taurus-Littrow highlands and valley area. This site was picked for Apollo 17 as a location where rocks both older and younger than those previously returned from other Apollo missions and from the Luna 16 and 20 missions might be found.
The mission was the final in a series of three J-type missions planned for the Apollo program. These J-type missions can be distinguished from previous G and H-series missions by extended hardware capability, larger scientific payload capacity and by the use of the battery powered Lunar Roving Vehicle (LRV).
Scientific objectives of the Apollo 17 mission included geological surveying and sampling of materials and surface features in a preselected area of the Taurus-Littrow region, deploying and activating surface experiments, and conducting inflight experiments and photographic tasks during lunar orbit and transearth coast (TEC). These objectives included: Deployed experiments such as the Apollo lunar surface experiment package (ALSEP) with a Heat Flow experiment, Lunar seismic profiling (LSP), Lunar surface gravimeter (LSG), Lunar atmospheric composition experiment (LACE) and Lunar ejecta and meteorites (LEAM). The mission also included Lunar Sampling and Lunar orbital experiments. Biomedical experiments included the Biostack II Experiment and the BIOCORE experiment"
For Mission Highlights, visit the Kennedy Space Center link.