1) Attend the comic-book panels, not the movie ones.
Conventions are often the kind of place where comic-book fans and
creators can interact on a personal level and talk some shop. All the major
comic-book companies have brought in their top talent to answer your burning
questions and tease at what's on the horizon for your favorite characters.
Don't waste this opportunity by attending the debut of a trailer you can find
online three hours later. Mix, mingle, and get all the candid information you
won't find anywhere else.
2) Collect, Collect, Collect
It wouldn't be a comic-book convention without tons of comic
books, now would it? Conventions of this size have enough comics in them to set
the entire city of San Diego on fire, making it the perfect place to fill all
the missing gaps in your collection (or commit larceny - your call). Searching
for that special issue of Hulk where he's bright purple instead of green? Us
neither, but no doubt there will be dozens of copies floating around. More
often than not, sellers can be haggled down to cheaper prices, so make sure you
pack some negotiating in your utility belt.
3) The clothes make the man
When you think about it, the San Diego Comic-Con is just a really
big excuse to play dress-up. Where else can a 300-pound man dress up as
Skeletor in broad daylight, and not have the cops called on him? They say
copying is the sincerest form of flattery, so show your passion for your
favorite comic characters by, well, being them. And depending on the quality of
your costume, you can actually gain some street cred on the show floor from
fellow nerds. Just a note to all of you dressed-up Jokers: If you see someone
dressed like Batman, do NOT challenge them to a duel. On top of looking like
complete idiots, you'll probably get thrown out.