I was able to attend last year's Masters on Thursday, as well. You may know all of the information below already, but, if not, here's what I learned last year:
Be sure to get there when the gates open and walk briskly (no running at ANGC) to the first tee so you can see the ceremonial tee off with Palmer, Nicklaus and Player, which was, by far, the best part of the entire experience.
ANGC also has a photographer stationed in front of the clubhouse each day who will take your picture next to the iconic U.S.-shaped flower bed with the clubhouse in the background. They upload the photos to the Internet and provide you with a code to download your pic for free. Since cameras aren't allowed during tournament rounds, it'll be the only photo opportunity you'll have.
The gift shop has folding Masters chairs for sale for $40 a piece. If you buy one, each hole has a special roped-off section where you can set it up and watch the action. We spent most of the day in the section by the Par-3 12th hole tee box because you can watch the golfers putt on 11, play all of 12 and tee off on 13 from that one spot. We later moved into the section next to the green at 16. The folding chairs have a slot you can slide a business card into in order to identify your chair if you decide to walk around.
I'd recommend hitting the gift shop early in the day and buying all your souvenirs. As you exit the gift shop, there's an area where they will hold your bags until you leave and redeem them so you don't have to lug them around all day.
I stopped by the Eisenhower tree on #17 and picked up a pine cone as a souvenir. It's in a plexiglass case in my Mancave and will be the cheapest and most unique souvenir you'll find at Augusta National.
Another cool thing is that you can sit on the down slope of the fairway of the Par 3 6th hole and watch the golfers hit shots over your head.
We're attending on Thursday of this year, as well, and I'm counting down the days.