Only for certain areas with pavillions and its a good idea for camping
No you do not just for parties in the shelters
Just other PLACES. In the park camp ground s&shelters
For the shelters yes, some are open for the public through out the park without reservations... Camping yes
I never been there, I heard they rent boats, for how much?
You must reserve a spot for camping or any other the shelter areas, lets say for some sort of partyor something
In the campground, no, but there might not be any spots.
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