There are two things I do. I always play HC TDM, unless a map pack comes out, then I play that playlist for about a day.

Anyways, the first thing is if I'm playing with a friend or two, we set up a class of a Remington 870 MCS with any camo, and only a suppressor, a B23R with any camo and just a suppressor, and Blind Eye, Cold Blooded, and Tactical Mask. We find a small little building or room to sit in the entire game (if possible), and just defend it. We try to stay in the spot for as long as possible. If we need to switch spots, we will.

The second thing I do is if I'm playing alone, I'll try to play like a soldier (very piss poor soldier though. I'm bad). I'll set up an Assault Rifle (SCAR-H right now), with no camo or emblem (clan tags optional), with a normal Reflex Sight (no special reticles), and a Select Fire. My secondary is a Tac-45 with no camo or emblem. I have a Frag Grenade and two Flashbangs. My perks are Lightweight (faster soldier), Toughness (body armor), and Extreme Conditioning (soldier can run for longer).

I do these activities a lot, and they're pretty fun.