im planning a trip of about a month early nxt yr will spend 3/4 days in BK b4 flying to samui and making plans from there will be travellin with liike minded pals who all enjoy a beer and fun with the ladies and would also be wanting to do some activitise as well as lazy days by the pool/beach. so if anybody has any idea how much money i would need to take or any handy hints that may be of use will be much apprecieated thanx

I cannot really estimate the cost of your entire trip but at least you will like to go out to clubs/bars... and drink a lot when you are in Bangkok. I only know about Bangkok. If I am in Bangkok for 4 days 3 nights, staying at a small/affordable hotel like Rex in Sukhumvit or First House in Petchaburi, I'd like to keep 600$ in my pocket, just to be on the safeside. 100$ for hotel. Normally I spend about 40$/night on drinking/partying, that's a lot of drinks and you don't want that everyday. The rest is for food, a little of shopping, and maybe to invite some girls for dinner. :D.

things have gone up and in Samui you can pay through the nose if you are not careful.
beers are about 70 baht for small you can get them for 50 in some places and i would not be wanting to pay much more than this.
We can do 3 weeks for the 2 of us on around £900 spending money that does not include hotels but is doing whatever we want when we want.

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Kiss
God laughs at people who make plans.

In my experience it's possible to live very cheaply anywhere in Thailand: if you hunt around you can find cheap digs, cheap food, cheap drinking, and there's cheap transportation if you want. But your budget will go flying right out the nearest window the minute you walk into a bar and start to monkey around with the bargals. They are experts at getting you to relax and open your wallet and blow your dosh, so bear that in mind.
Some tips I use. Generally when on holiday my wife and I will eat cheaply at breakfast & lunch (just noodle soups & fried rice dishes for a couple of dollars) but will splash out a bit for dinner and have a nice meal.
As I mentioned drinking beer in the bars can become very pricey but you can reduce this by buying cans in the 7-11 shops and drinking them on your balcony or around the pool, also most 7-11s and mini-marts have some seating outside and the “Cheap Charlies” (like me) can buy beers inside and drink them out front. I often prefer this as you watch the interesting people passing by.

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You're only young once, but you can stay immature forever.