In reply to AJay:
International Camping Olympia to the north of Cortina on the bank of the rive, it is very friendly with clean amenities, an onsite shop, bar and occasionally restaurant. They seem to mostly cater towards campervans so choose your pitch carefully to avoid the really hard ground if you're not using a free standing tent.
It is a little bit on the expensive side, but have been back a couple of years in a row and would return again!