Yes, definitely yes
Yea you don't have to make reservations but like he said you may find limited availability.
It's better to reserve before arrival. You can see if there are any availabilities for the same day but I think if you do that you can only camp for 1 night.
No you don't. You can arrive without them but you take a chance on there being limited availability
Yes u do
Not really, but it's better if you go for sure with your reservation
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