Wendy, there are plenty of narrow and tricky spots on the lake, you can avoid most of them until you are comfortable with lake and your boat. Given where you keep you boat, you will be looking at and avoiding the Witches every time you go out.
The Witches is a big pile of rocks in the middle of a large open area of the lake. Pretty easy to see and miss if you look for them.
The Graveyard is a narrow path through rock fields on the other side of the lake, you can avoid the Graveyard forever, or at least until you feel like a challenge.
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