I hate to be the posture police, but in the interest of trying to be helpful, may I suggest that when snooping, try not to bend your head and shoulders forward, as in this picture on the left, since this leaning-posture while walking around is a dead giveaway that one is, in fact, snooping?
I feel sure that in a Burn Notice voiceover somewhere, there is a Michael Westen commentary that defines the proper way to skulk.
Also, have a cover story ready in case you are apprehended. When the Bad Guys demand to know what you are doing here, tell them, "I'm looking for the ladies' room." But if you are snooping in, say, a men's locker room, be prepared to have this cover story disbelieved.
Don't take this suggestion as criticism, for in fact, I like this picture! Ms. Amy makes a lovely damsel in distress!