When NOT to trade?

I've been trying to make a list of time when it's not your best interest to trade, be it because of bad liquidity, or because bad volatility (too little or too much). Was wondering if I can get some help completing this list.

Please keep in mind two things:

1) I'm on New York time, in case it's important.
2) I'm interested in the E$, the UJ, and the GU.

This is what I have so far (time, followed by reason not to trade)

Time of day: Sundays (Asian session) and Friday afternoons - little liquidity. Set ups tend to fail more often.
Major news (30 minutes before to 30 minutes after) - ridiculous spread. Too volatile for my newbie reflexes.

Hmmm... That's it. That's all I've got.

Anybody care to help me complete the list? I KNOW that there are days that forex veterans would rather just take off and go to the beach than watch their set ups fail again and again. What days are just bad for trading in general (and for newbies in particular?) I've heard someone mention something about "triple witching day?" What is that? Also, I hear that the NFP can give your account a heart attack, but... Is it enough to avoid 30 minutes before and after the NFP? Or would you take the whole day off? Are there any other days that it would be more advisable to take a mini vacation rather than trade?

Thanks!

I don't like the huge spread but otherwise any time is as good as any other to trade.

Better during the usa's session and 5hours before, more bang for you time really.

As to over news, coming to the opinion trade like it isn't going to happen, worrying about stuff just creates excuses not to trade, after all 50% of news is going to move the market in your direction, 50% it won't, factor in a tight stop and it's a win win situation anyways

After you've been drinking lol It sounds ridiculous, but it's so true.

As for timing on trades, you have to realize what pairs you are trading.

Obviously, the gbp is active during the london session. The US during new york. The jpy pairs during tokyo. etc.

when you are tired. You may miss something on or mis-interpret your charts.
when you are sick. Same as being too tired.
when you feel you HAVE to make a trade. This is when you will force the trade and end up losing.

Honestly it depends what your trading setup is. Different systems work better during different times. Only time I can see that you don't trade is when you have doubt about your trading plan. Everything is tradeable, and is traded, else there would be no market. You have to determine what your system or your trading philosophy calls for and then you can rule out what works or doesn't work. Don't take my or anyone else's word for what times are good. It just may be good for them. I'll give you an example, some people don't like the asian session because of low liquidity, etc. But if you trade the jpy pairs, you can find very good trading opportunites around those times. At one point I was trying out some scalp setups, and I found that my scalps, or what I wanted to see in the market, occurred best during the 1:30 - 4:30 am est, so thats before the london open, and the same scalp setups didn't work out that well during the NY open, so it all depends on what type of price characteristics you are looking for.
I know you said you are a new trader so your question seems like a logical thing to ask, but as you trade more and more and try different setups and different systems you will see that the times that are best not to trade is purely determined by your trading philosophy and or system.