The pavilions are usually first come first serve. Usually always at least one open.
Yes
Reservation is required. It's 30 dollars. Easiest when done online.
Sometimes people send one person to call it and hold it till the others start to get there
Yes all are open for reservations. Look online or go to the one you prefer and look for signs posted about reservations
Yes but the east part of the park maybe closed for flood clean up
Thanks! Your answer is awaiting moderation.