Or, a slightly shorter route, if you're on the dolmus / walking. Get off just after the sign for the end of Kargi ie Kargi with a cross through it, there's a small workshop on the LHS with a road opposite. Take this road, the first part is quite a gentle level stroll, later you start to go uphill & there the road forks. Take the LH fork (it was signed for the museum) & from here to the museum is quite a steep climb, but shaded by the forest. I think it took us about an hour to walk up there, but rather less to come back.