Sherman Island in the Delta is a great Place to explore!
We took the family out on the Kayak to check out the area. We parked and launched at a small beach at Sherman Island County Park goo.gl/maps/iaA2ndXoZU8dyhh48
The area includes part of the Sacramento River.
The water was a little choppy which kept us from paddling out to the smaller islands off the coast. This can be a good area for fishing for Striper and Sturgeon as well.