Securing the area | Mission 4:
Frozen Paradise Crysis Warhead Guide

This is a side mission, however you shouldn't ignore it, because you have a unique chance to take a closer look at the surrounding area. Defeating the monsters now will also make your future battles easier. Use your personal map to locate enemy creatures and kill them with your primary assault rifle (screen). You don't have to kill all the monsters to fulfill this objective, but you shouldn't leave anything alive behind.