A scatter of small uninhabited islands in Loch Dunvegan, Eilean Mòr and its neighbours are the haul-out grounds of a substantial colony of common and grey seals. The boats that run from the castle jetty in summer take about half an hour and get close enough that you can hear the seals on the rocks.
Bring binoculars and waterproofs — the loch is exposed and the weather changes fast. The trips are weather-dependent and the schedule is informal; check at the castle ticket office on the day.