In reply to Rampikino:
There's a little pamphlet style guide to some bouldering spots around Arco that I picked up in one of the shops there. I lent it to a friend & don't seem to have got it back yet
so no further details available. Also some marked circuits at Passo San Giovani that iirc weren't in the pamphlet, but easy enough to find.
Post edited at 10:34