Uh, you're overleveled, yet cannot find a bunch of stuff that just requires exploring around a bit. the runestones aren't that hard to find, just look around the mausoleums a bit. One of them has an obvious puzzle to bump into that requires a bit of searching, the other has it in a back room of the building, and the last is on the right side of the building after the large undead miniboss squad. Out of all the areas, the graveyard is the easiest to navigate and to find the runestone/quest objectives for. It just takes a bit of looking and investigating clues for the puzzle on the gravestones.
Also it woudln't be a secret outpost if it had an obvious beacon. You'll stumble into it if you explore the extra forest path on the north end of the ancient woods. If you need a hint, it's near a lake.
Also there's audio queues for doors with beeps. So for any obstructions along a pathway. HOnestly I just found the annoying beeps and noise in VG games a bit annoying, and the only queues you need is whenever a turn can be made. I dont' need to be constantly reminded i"m walking against a wall.