Yes, like Dee said, SAB doesn't open until later in the morning (10 am I think last summer), however, that doesn't mean a competition isn't going on!
One of my DH's favorite BC stories to tell is the time he was waiting outside the entrance to SAB near Hurricane Hannah's. He headed down before us to grab a frozen drink and to get us a table with umbrella as we were spending the day at the pool.
He could tell there was something brewing between a couple of ladies who obviously had their eye on the same table. As the CM let guests in for the day, those two took off at full speed trying to outdo one another.
One lady goes as fast as she can walking the pathway between the sand bar and the lazy river to wrap back around to the table just on the other side of the kiddie pool area.
The other lady has her flip flops off and goes flying into the zero entry pool, attempting to "run" across the pool with her belongings help up over her head and get to the table first using her "shortcut."
He truly couldn't believe what he was seeing.
As I recall, the walker ended up "winning" and was the lucky recipient of not only of the coveted table but the ole' stink eye as well. But I don't think she cared 'cuz she was looking like this ...
SO ... the point is, there will be several people there waiting to enter when it opens up but as long as you are one of them, you won't have a problem getting a covered area either at the tables around the kiddie area, across from the sinking sands or even up under the pergola.
If you only want chairs, there will be plenty at that time. The tables are harder to come by after about 10:30 am -10:45 am or so until someone leaves.