The beauty of a windless day and finding the animal feeding. They stay in the same area and we can turn the engines off. Such peaceful moments on the bay, surrounded by the sounds of the sea. The gentle lapping of the wavelets on the boat, the seagulls bickering over fish, the mackerel boiling at the surface, the cute back and forth of guillemot hitch pitch chick calls and deep growling parent. And of course our favourite: the "ksssshh" sound of a whale exhaling. As soon as we hear it, all the heads whip up in the right direction to observe the Minke whale slink back beneath the surface in a smooth dive.
You already have a very successful trip when you hear a whale's breath. The White-beaked dolphins cruising by are the cherry on top.