I was just HBing out of Silverthorn two weeks ago. I bent my prop on the first day! WATCH OUT FOR TREES! If you go back towards Jones Valley (up the mouth of the Pit arm) on the left is a great inlet. We parked back in one of those coves. I hit my prop up the McCloud arm. Everyone all says beware in the Pit, but it was the McCloud that got me. Shasta will hook you! it is an awesome lake.
Go right out of the marina and then up the left arm like Micah said. Yes you will see tree's sticking up in the middle of the lake but there is good riding all around both those arms. I wouldn't waste the gas or time to lug the HB any farther than you need to.