Internext is just like any other business trade show, its all what you make it to be.
Ideally, have some set appointments with people for when you are there, some party invites confirmed and network amongst your peers.
Have plenty of business cards on hand to hand out to new contacts and really limit to what you drink while "working" and making contacts, first impressions, etc.
Once your done the working aspect, definately have some fun and enjoy yourself. You dont need to be puking your guts up, throwing shit from balconies, stealing shit or being a dick in general to have a good time at a convention.
Note the info you collect, do your follow ups and research on new people / places / programs that you see there and you'll be profitable
