This is what I usually bring to my explorations. It may vary a bit depending on the location.

*

Girlfriend with Nikon Coolpix
Leika (the maniac dog :-P)
Smartphone (GPS, map, internet, camera, flashlight)
Good footwear

*

Lowepro SlingShot 202 AW
with
Nikon D5100
AF-S DX NIKKOR 10-24mm f/3.5-4.5G ED
AF-S NIKKOR 50mm f/1.8G
Manfrotto TR190XPROB+HD496RC2
Xtra battery EN-EL14
A couple of SD cards
Protective Mask 755
2x Mini Maglight
LED Headlight
Leatherman
Bandages
Gloves
Lensepen

*

A good mood! ;-)