I highly recommend contacting Leland Miyawaki at the Bellevue Orvis Store. You can't do better than that for having a great time in that area.
April is a good time for blackmouth (resident king salmon) as well as ocean dolly varden, cutts and resident coho salmon. It's also a good time to take a reasonable drive out to the Peninsula for steelhead (read up on the regs as April is encroaching on the protected season).
Halibut are inside the sound and there is often a slot ocean king salmon fishery not too far from Hood Canal.
Or just enjoy the dungeness crab, oysters and butter clams.
IFFF Certified THCI @ 2005
Capeflyfisher Guide Service
Island Hopper, Guitarist, Incurable Dreamer
and Founder, Worldwide Flyfishing Forum