You can book a boat trip in the hope of seeing them, or head for the beach at Chanonry Point on the Black Isle.
We opted for the latter, as a boat trip in freezing fog (-5c) at the end of December did not appeal.
Optimum time is supposed to be on an incoming tide in the summer. We had the incoming tide, but...
Well, we lasted about 20 minutes before hypothermia started to set in (my buddy has thin Mediterranean blood, not suited to the rigours of the Black Isle in December). We did have a sighting each, but hard to tell if it was a routine porpoise or a famous dolphin. Better than nothing!
