From the S. Lucia train station cross the water and go right 300m to the bus station just after the 2nd bridge. For the direct summer shuttle wait at D1 (yellow, in the far corner). Otherwise, wait at A8 (red) and take bus #5 to the airport and switch to bus #15 in the direction of Ca' Noghera and get off at the 4th stop in front on the campsite.