Would the Star Maps from KOTOR still exist? If we found them, it could lead us to the Rakatan Homeworld, which would have some tasty lore and stuff for us to learn.. plus, hey, another secret base..
Furthermore, I wonder if we could try and find out about the Je'daii and the lore around them.. plus Tython would be useful.. I think it's been abandoned for a while, and it's not really that well-known, so y'know, we might be able to get some decent stuff.. plus it might give us some ammo in helping prevent Anakin from going full Dark Side evil, as well as trying to bring balance between the various Force Sects..
On another note, we could try and find the Telos Holocron.. it's got loads of knowledge from various Sith Lords over thousands of years, and it's just sat on Telos...
There's also this holocron called the "Great Holocron" in the Jedi Archives with a lot of information.. if we were super sneaky, we could try and get some knowledge out of it.