Check the billboard for the departure landing of the boat.
You can board directly (no need to exchange your ticket).
The boat heads directly to St Gingolph which is at the end of Lake Geneva before returning to Lausanne via Le Bouveret, Villeneuve, Chillon Castle, Montreux and Vevey. Between Vevey and Lausanne the boat will go along the vineyards of Lavaux (UNESCO Heritage) with several stops in the wine villages of the region.
On the midday cruise it is possible to eat on board (reservation required). The meal is to be paid on site.