The following is a List that I have gathered through years of experience and research. They don't neccessarily apply to an Outdoor Adventurer. You Pick and choose your priorities according to your destination and the length of your stay.
Gear Essentials
Day Pack (X)
Flashlight (X)
Compact Binoculars (X)
First Aid Kit (X)
Sunglasses
Multi-tool (X)
Watch
Sunscreen (X)
Water bottle (w/ filter (X)
Hat
Whistle
Map or Travel Guide (X)
Compass or GPS receiver (X)
Pre-Departure
Passport
Visa if needed
Health Documentation
Transportation Tickets
Frequent Flyer Cards
Emergency Information
Insurance
Hotel Reservations
Traveler’s Checks
Currency (both local and American)
Credit Cards
Guide Books and Maps (X)
Trip Cancellation/ Medical
Information
Copies of Passport, ID and Documents
Special Event Reservations
Travel Gear
Main Travel Bag (Duffle/Luggage, etc.)
Packing Accessories (clothes, small stuff and toiletries)
Centerprises - are the owners of the http://www.TheCampingGuide.com which offers Camping, Hunting, Outdoor Gear and Information in General about the Great Outdoors.