umrules:
We have a family place on the lake that was purchased back in the '40's, so I guess I could tell you a little... I was just up there over the Memorial Day Weekend.
It's a rather big lake for Western Washington and there is a public access via the county park reached off of Highway 3, BUT NO CAMPING ON THE LAKE. There is also a Simpson park for their employees only. The closet camping would be over at Belfair or Twanoh State Park on Hood Canal. Also, there is no fuel or store on the lake - there was in the past. Be advised that the lake is heavily used by skiers, jet skis, etc. It is a very busy lake on nice weekends. Your best fishing is very early in the morning, but as it warms up be prepared for a bouncy ride.
As far as fish, what do you want? The lake has kokanee - not real big, bass, perch, catfish, crappie, some rainbow and cutthroat. Use standard kokanee rig- pop gear/ wedding ring / maggot. Bass - choose your weapon. Perch - anything - they also tend to be smaller, but some 12 - 14". There are also trash fish - what I call squaw fish and suckers - some of these get big.
If you have questions, let me know, I'll do what I can. There are other lakes outside of Belfair towards Dewatto with camping that you might want to consider.