Going way back, and in no particular order:
Have an offline copy of the schedule, and don't count on the wifi staying up.
If it's not already, make sure your dev environment is fully set up.
Review the schedule, downloading, and perhaps installing any software/libraries mentioned in talks you find interesting, (saves you missing 10 minutes of the talk)
Realize that for a lot of things, a simple note that X exists and what it's called is enough for future research.
Roomshare. You'll learn a lot, and meet people you wouldn't otherwise.
Go to the sprints if you can. Go out with people in the evening.
Have fun!