I think you missed all of the experts that on the road to the Jax tourney, so you get me instead.
Yes, don't know, yes and yes.
Only been out there a time or two but yes there must be something east 'cause the last monthly meeting there (more than a year ago), one of the guys with local rep status headed that way

. Given that he was headed into a pretty stout wind maybe the reason more went the other way. And he may have just wanted some open space.
Don't know about traffic to Big Pass.
Yes, most people headed to East River although that is not where the big fish came from. Again, it was pretty windy so that probably influenced the choice to head for shelter of the river.
Yes, you can get a yearly pass or a Federal Duck Stamp that used to be $15 ( I think). The advantage of the duck stamp it gets you into all of the other federal parks as well I think. I just remember thinking that the duck stamp is a better deal in most instances. The down side is the federal stamp is locked to a calendar date and I think the start/stop date is July 1 (see below). As for the exact details on the duck stamp please "trust but verify" me there.
Check here for more info (Jean's very timely info but remember that it is last year's info)
http://www.fcka.net/phpbb3/viewtopic.php?f=27&t=3238&start=15#p17187