Take Road number 4 from Rovaniemi, and drive south towards Kemi. Drive about 12km and turn left
when you see the sign on the right side of the road saying "Hiidenkirnut" ( also a sign saying valajaskoski)
You will go over the river on a dam. After that there is sign "Hiidenkirnut" showing to turn right, so do it.
Drive about 8 kilometres on a road number 3090 and you'll see a sign saying once again "Hiidenkirnut"
Turn left to a small gravel road, continue about 2km and you'll find a parking spot.
There is few rocks near the parking spot .
Best rocks are quite hard to find but, i'll try to explain...
From the parking spot start walking back where you came from, about 150m.. There is a Small path turning right. walk the path about 300m until you see rocks (too small to climb) on your left side. Theres rocks on both sides of the path.
But it's quite hard place to navigate so i'll recommend that you contact some of us, who knows the places.
Rovaniemi climbing clubs homepage ( http://vuoristoklubi.tripod.com/
If it helps...at least theres a forum.