Hidden (Better) Weapons around the map. Like this, people could do an excavation around the map, or search in the normal land, for better weapons.
They could be:
AK47 - Better SMG, more shooting power.
AWP (a type of Sniper, in Counter Strike) - Better Sniper, can shoot in longer distances.
Combat Shotgun - Better Shotgun, don´t have to "Pump", ya know? Have one of these in counter strike...
PickAxe (Like someone suggested) - Better Spade, more melee power and block breaking power.
Metal Bricks - Better Bricks, they would be really hard to break, like 10 Spade attacks...
These weapons could be found all over the map, except in the team bases. They would replace your default weapon.
Comments please.
(If there is any grammatical error, sorry, I´m brazillian).