Exciting times! I grew up out on the Island and am counting the days until I can move back. The trouble is my wife loves her job and its 5 minutes from home, so patiently waiting lol.
Not much to add on the river fishing; the others have covered a lot of it. Almost all rivers that lead to the ocean have steelhead potential, so you don't have to stick to the ones in the lower mainland. You can be the only person on a river having a great day if you do a little hunting
Don't overlook Hemlock or Cypress..right after work for a few rides. Nighttime at Grouse can be spectacular when its clear and cold!
I would advise you to spend the 200 bucks on a float tube and fins. I assume you have waders lol. Every lake has rainbows, cutties, or bass potential. Some have all of them! A short drive to the Cariboo and you are into BIG trout. You don't need to fly fish if you don't want to, spinning gear will work. The other bonus on trout fishing is it never closes. Lots of little lakes that are short hikes away where you can be alone too.
Fishing licenses are a big difference; you need one for fresh, one for salt water. You need stamps for certain species. You need a certain stamp to fish for salmon in rivers, you need a special steelhead stamp. I think you get the idea lol. Buying all of them ( which I always did- nothing worse that getting the call and being unprepared was 100 bucks ten years ago) now you can get them online at least.
But the thing I miss most is Dungeness crabbing, picking oysters and mussels, and digging for clams. All you need is a basic saltwater licence for that.
Oh ya, and traffic really sucks in the lower mainland and the price of the ferries will shock you.
Best of luck,
suds