I've been playing the Crysis 2 campaign and i still haven't gotten bored yet 

 The only that bugs me is out is that the hidden stuff (i.e. dog tags, emails, vehicles, souvenirs) are ACTUALLY hidden; this is why i play each mission for like an hour each 

 looking around every nook and cranny to make sure that i don't miss those collectibles. Please share your ordeal while trying to find those little collectibles (and some hints on how to spot them easily 

 but dont give away their positions)
P.S. This thread is not in any way trying to make the collectibles look bad, its just to learn people's experiences while looking for these very hard to find objects. 
P.P.S CRYSIS 2 IS AMAZING!!!!