It is all quite situational. Are they looking for me and all know what I look like, rough description, just a person in an area, simple security setup, do they have weapons (I can run very fast and hit very hard, can't outrun a bullet and my kicks have rather less range than most bullets), do they have night vision/thermal vision, do they possess training and the discipline to use it? Is this a containment/line of men scenario or just one person I might be able to go the long way around for?
Do I know the area?
Am I allowed misdirection? Sneak somewhere the other side of wherever (possibly not close enough), set off a large bomb/general distraction after having moved to somewhere else. While things are distracted, reinforcements dispatched and otherwise people reduced then yeah.
How long are they around? I am quite content to fall asleep in a wall or floorboards if this is more of a "I just need to wait for the search of the area to happen".
I am not inclined to underestimate blending in with a crowd either, and can often do a disguise quite quickly in many urban scenarios.
I can crawl along through muck, small depressions in the ground wearing local foliage if I have to. Quite slow going though and you tend to want to wander in prepared if playing that one and sadly I don't own a ghillie suit.
Being clad head to toe in black is... most of my clothes. Granted black is not necessarily the best option for many things. To that end I can move slowly and with an eye to sight lines, patrol routes and sound if it is necessary.
Going where people don't expect or want to go is a good plan. Hard to get to, disgusting, full of prickly things... I would note I am reasonably proficient at climbing as well.
Is this a social engineering situation? Why ninja through a building if I can walk up to the front desk, claim to be IT and get given an all areas badge?