So I want to start keeping a hunting log/journal this year and need to know what kind of things I should record. So far I am thinking:
1) Weather conditions (Barometric Pressure, Sun, Temperature (hi/low), humidity?, wind)
2) Moon phase
3) Game activity
4) Sunrise/Sunset times
5) Stand location
6) Hunting times

What am i missing or what do I have that may not be necessary.

I keep a log and I note down most all of those things but I suggest you write it in a way so that some day when you can't get out anymore you can read your old entries and relive it. If I'm fortunate enough to take an animal the entry will be several pages long and I try to stick a picture in there.

What about deer food conditions? i.e. "a lot of white oak acorns", "Cornfield planted this year". etc.

Crop rotations
The date I first encounter sign, it's location and all subsequent sign
Hunters I see in the woods and direction of travel

My journal has

Date-
Location-
Weather-
Time-
Game sex & size-
Stand/Blind Type-
Rifle-
Bullet-
Shot Placement-
Yardage-
Blood Trail Length-

yes, it also give me something to do while I am on stand as far as conditions and sightings. I mean what else you got to do while sitting in the stand, right a book. Mine are usually a paragraph of 1/4 to 1/2 page each hunt. and yes they really do help.