Sleep and showers are overrated.
Bring tools and an air compressor. That way you won't need any and everyone that camps next to you can borrow them.
Don't worry about getting lost. There are only two entrances/exits to the dunes and they both have a flashing light you can see at night.
There is no quiet time in the camping areas. If this bothers you get over it now, it won't change anything.
Bring good riding gear and have fun. I need to make a trip myself sometime this summer. May just take off the dates you are going so we can hook up. I need an excuse to ride.
Buck