Tools of the Trade
Patience
Planning skills
Experience
Mountain boots
Survival gear
Binoculars
Walking stick (because it helps, and because it looks really professional)
A GPS
A map and a compass (in case GPS fails)
First Aid kit
Ruggedness
Optional, depending on the situation: Mountain bike, canoe, raft, kayak, ATV, SUV, MIB, airplane, parachute