Directly in Arabba you can take the cableway Porta Vescovo, which will let you reach the Passo Pordoi and Belvedere. From there you follow the yellow indications, which stand for the Skitour Panorama. You will reach Col dei Rossi, Alba di Canazei, Ciampac, Sella Brunech, Buffaure and Pozza di Fassa. In Pozza di Fassa you will have to turn around and come back by the way that you came.