The do's and don'ts...

Don't vomit in his lap.

Just be yourself! Dont try to rush thing's, or be overly serious.

Dont pretend to be something you're not, as said before..just be yourself & if that does'nt impress him then he's not worth the bother

Drop my knickers at the first hurdle....

NO!no!nooo! only joking...

...best way to impress a guy is to be yourself as others have said, at least then you know if he's impressed, it's for the REAL YOU

I think the whole way you present yourself matters and so for a good impression you also need to look and feel good and be comfortable in your own skin.
As psychologists are always telling us, you only get one shot to make a FIRST IMPRESSION and likeability is usually judged in the first few minutes of meeting somebody.

Turn up naked with beer!

Oh, wait a minute.....

Be yourself, so if you have a tendency to pass wind, don't hold back.
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"Always look on the bright side of life..... tetum tetumtetumtetum....."

http://www.youtube.com/watch?v=jHPOzQzk9Qo

You're killin' me Tracy, I love your attitude.

I would be impressed if she insisted on paying for our drinks!

Oh and also if she could hold a conversation about formula 1, had an old car that she fixes herself when it goes wrong, (and could park it properly first time every time), could play a decent game of pool/golf/Gran Turismo, and wasnt bothered about getting dirty (and by that I mean doing gardening, DIY, etc.....oh, and in the sack too of course )

thats just me though...
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I don't...they have to impress me

act like a nympho on weekends.. simple

Only on weekends? You are generous.