I have not explored the inlet (and be warned about the pm inflow winds) but you can catch a water taxi there and back and spend the the days exploring Spring Island, which is a very beautiful. Arrangements can be made through West Coast expeditions, who are happy to offer information and advice. They also rent kayaks.
Or Rugged Point Provincial park is a closer and a more protected paddle, but be sure to check the wildlife warnings before you go. Previous years the park has been closed because of cougar or wolves but that was a little while ago
Fair Harbour itself is very inaptly named. How many days do you have, and why Fair Harbour?