I've found that one of my favorite places is the exhibitor floor. I've found that a lot of the information in sessions I'm able to find online or in books, but when it comes to rapidly learning about what's going on, nothing seems to beat the pavilion floor.
JavaOne always means two things for me - first, make a list of stuff to check out as soon as the conference is over, and second, buying a lot of books at the bookstore at the end of the show as a treat.
This year, I'm making my "to do" list public, a sort of meandering of the developer's mind as I wander the show.
So, tomorrow is the unofficial first day of JavaOne. Having been to every single JavaOne since it started (and NetscapeOne a year prior), it's become something of a ritual to spend a week in summer at the Moscone.