always watch your ass
Be aware of your surroundings.
Don't carry any more cash then you'll need.
If you're married. Use a pre-paid phone, and keep it locked somewhere safe.
If you're married, don't cruise for poon on your home computer. Use an internet cafe. There are 3 cafe's i use in my travels. One is in coquitlam on north road across from the denny's, the second is on Davie Street, oddly enough across the street from a denny's, and the third is in an acrade on 3 Road in richmond (about 2 blocks south of the canadian tire heading towards landsdowne mall)
If you're married have a plan that won't arouse the suspicion of your SO. e.g. "why is my husband going out at 1130 on a Sunday night the day after i found an ATM withdrawal slip for $400.00 in the pocket of his favorite golf pants?"
At the very minimum keep a bottle of mouthwash in your car. I keep a gym bag with a change of clothes, a toothbrush, paste, and mouth wash. A travel bottle of aftershave doesn't hurt either (i use axxe kilo and it always gets compliments)
going back to the know your surroundings deal...know your exits. when the shit goes down, you gotta be ready. if you find yourself stepping into an apartment/house with a crack head pimp boyfriend waiting in the closet you can't just run around blindly like homer simpson after he's been set on fire in that episode where he was running a distillery out of his basement. have a plan as to where your going to go if you need to get the fuck out of dodge and FAST.
if you're cruising for snatch on the low track, keep anything you don't want lifted in the trunk. safe and sound. cell phone, wallet, money clip, etc. i rarely cruise for snatch anymore, but it doesn't hurt to keep a dummy wallet with a couple of bucks in it just in case the need arises. a can of bear spray too if you're more paranoid then i am.
know your rights. if you're balls deep in the mama-san at some micro and the feds come in strong through the doors and windows and you get caught with your pants down don't let fear get the best of you. be polite, cooperate, but don't give away the farm. don't get strong-armed by the long arm of the law.
if you walk into a place and the pic in the paper, doesn't match what's hiding behind the door. just walk away. i always read about chumps who would feel guilty about walking away. ask yourself this. do you think she'll feel guilty about misleading you while she's counting the wad of twenties you leave on her night stand? **insert music from the gambler here**
always know where the good parking spots are.
never EVER fall in love with an SP. preluding to that dont even THINK about dating an SP. you're not richard gere, she's not julia roberts. you want a relationship? look elsewhere. save your heart, and your wallet a lot of torment.
last but certainly not least. have your post-pooning meal planned out. after i fuck i have to eat. most guys roll over and fall asleep. i get HUNGRY. weather it's a slurpee and taquitos, or a steak and a beer know where you're going afterwards
oh, and have a plan B. there are a lot of jammers out there. one particularly on this very forum.

so if you find yourself in front of an apartment building and getting nothing but voicemail...at least have an idea as to where you're going to go if everything goes to shit all of a sudden. i find places like munmuns or ada/heidi/yoyo/jojo can be very accomodating on short notice.
oh and finally. take your socks off first. ladies. back me up on this.