You are male and you should just be yourself and you'll be behaving male
but... if your looks don't pass incredibly well and your looking for other ways to help "appear male" then maybe just chill out and people watch at a busy place like a mall or food place. Note: Please don't look like you are checking these guys out if you are not in a very accepting area just casually watch because I don't want a homophobe to think you're checking them out and have you get hurt.
The nod is a great one. I remember going through a drive-through with my mom and an officer walked by and gave me the nod so she was like "why did that cop just nod at you?"

I was just like.... it's a guy thing mom you wouldn't get it but it was hilarious.
General advice: Women tend to walk with their head and hips while guys tend to walk with their crotch. No, this does not mean walking around while doing the pelvic thrust. It just means they tend to have a lower stance, usually walk with more authority, and are confident.