Sunshine Coast is beautiful. Not sure about the fishing over there. Here’s some of the stuff we did up that way a few years ago…
Coming from Sechelt, At Egmont is Back Eddy marina. It has RV sites that back right on to the water. http://backeddy.ca/
From the marina, you can take a boat tour to Princess Louisa Inlet and Chatterbox Falls. http://www.sunshinecoasttours.ca/princesslouisatour.html
Also right there is Skookumchuk Narrows Provincial Park. Great short hike to a very cool salt water rapids. The kayakers are usually playing in the very large standing waves.
At the very top of the sunshine coast is Lund. Very beautiful. It’s a jumping off point for the Mega-yachts heading into Desolation Sound. At Lund, you have Sunlund by the Sea for camping. A path from the campground takes you to the harbour where you can book a Zodiac tour of Desolation Sound. There is one run by the local First Nations Band. We did it a few years ago. It was excellent. http://ihostours.com/
BC ferries used to offer a circle route that gave you so many days to do the sunshine coast and then cross over to Vancouver Island. Looking quickly on the BC ferries website, I could not find it. It might take some digging, or they do not offer it any more.
Oyster farming is huge up there. Get yourself a good feed of them if you fancy them.
Rick