STAY UNTURNED
You're one of the few not yet turned zombie. Keeping it that way will be a challenge.

• Go in guns blazing and attract the attention of everything, living and dead.
  
• Take a subtle approach sneaking around and making use of distractions.
  
• Confront and learn to counter special abilities ranging from invisibility to fire breathing to lightning attacks.

STRUGGLE AGAINST NATURE
Zombies aside nature does plenty to make life hard.

• Forage wild fruits and vegetables.
  
• Hunt animals for pelts and meat, or in some hostile environments become the prey.
  
• Fish for food and garbage.
  
• Plant a crop and make sure it gets rain.
  
• Seek warmth and take shelter from blizzards.

DEAL WITH OTHER PLAYERS
Friend or foe there's a lot of interesting people online.

• Arrest bandits with handcuffs and blindfold them as a non-lethal strategy.
  
• Fight with every kind of weapon under the sun - swords, machine guns, snipers, missiles, landmines - you name it.
  
• Raid enemy encampments using charges and detonators and steal their loot.
  
• For pure PvP play arena mode in a last man standing battle to the death, or PvE for peaceful cooperation.
  
• Roleplay servers encourage everyone to stay in character and tell a story together.

HELP THE NEW SOCIETY
Plenty to do even if you're offline or going solo.

• Meet, talk and trade with NPCs.
  
• Complete quests to aid NPCs and progress the story.
  
• Fend off waves of the undead to clear hordes.
  
• Secure airdropped supplies.
  
• Gear up with gasmasks to scout radioactive deadzones.

FORTIFY YOUR STRONGHOLD
Somewhere to kick back and chillax or a hideout to direct your gang, whatever floats your boat (in this case sometimes literally).

• Build with barricades, furniture, traps, machinery and more.
  
• Board up the windows of existing structures to survive the night.
  
• Craft an entirely new structure from supplies you collect.
  
• Turn your vehicle into a moving fortress by building on it.

TRAVEL BY LAND, AIR AND SEA
Roll out in style with a fully stocked garage.

• Land vehicles including tanks, quads and snowmobiles.
  
• Air vehicles from helicopters to seaplanes to fighter jets.
  
• Sea vehicles such as jetskis and hovercraft.
  
• Maintain your vehicles with tires, batteries and fuel.

EXPLORE MASSIVE WORLDS
With 5 officially developed and 1 curated community created sandbox map there's a wide variety of locations to discover:

• Prince Edward Island (PEI)
  
• The Yukon
  
• Washington
  
• Russia
  
• Hawaii
  
• Germany

MOD EVERYTHING
From the ground up Unturned was designed for modding.

• Download player created content ranging from guns to vehicles to huge levels from the workshop, and upload your own.
  
• Build custom maps using the in-game level editor. All of the official maps were created with the same free public tools and their assets are open for you to use.
  
• Write plugins using built-in or strong third party systems.
  
• Get your apparel and skins upvoted in the workshop for consideration to be accepted and sold.
  
• Team up with other modders and put together your own update for consideration to be officially adopted.

NEAT STUFF
I think these features are neat and they didn't fit anywhere else. There's many more I want to include but for brevity's sake:

• Most objects can be destroyed to create new pathways.
  
• For immersion you can pick a frequency and use two-way radios to communicate with your squad rather than external voice chat programs.