You taking your own boat? I've been a few times and we took our boat and stayed at Boyettes. We fished the south basin which is the deepest, but had our best luck in the buck basin launching at a place called Kirby pocket. There is a stake line that the duck hunters have put out that you can run a reasonable speed on.

We went a few miles to around blizzard slough and fished the water and trees back in there. Once you get off of the stake line. IDLE! Depending on temps the big gills move under the trees as well as crappies. Just use a long rod and jig around the trees the fish are below them. We also caught fish in the deeper lilly pad stems. We were not set up to spider rig so we just used a slip and minnows for crappies while anchored.

The rental boats are very small and you would be stuck fishing near where you are staying if you don't have your own boat. We usually went around the end of March, but the gills probably won't be in the trees as cold as it's been this winter at that time this year