Journal: What would you record?

I've thought about the increasing amount of data I'm amassing over time about my life: CC receipts, GPS way-points, photos, etc. If you could wear or have a device implanted, and you could "magically" completely control who had access to the data, what data would you choose to record about yourself and your surroundings?

A basic list to start:
GPS location (would additionally need inertial for underground/water/inside)
Body Temperature and other physical/medical stats
Calories consumed/expended
Other humans/animals nearby
Clothing worn
Images of surroundings
Thoughts?

Eventually, most/all of this would be possible to record. What would you _want_ recorded? What would you most be afraid of others having access to?