Hi, JJ I went to Hurgada a few years ago on a diving holiday and really enjoyed it! I'm sure kiwicath will have a lot more detailed info, but useful things I can remember are:
don't have drinks with icecubes, as they may have been made with tap water, not bottled water
drink LOADS- it is very very hot, and you can easily get dehydrated. It is best to drink plain water, rather than fizzy drinks.
spend a couple of hours indoors or at least in the shade around midday
when you go out, cover up! Not only do long sleeves and skirts or trousers protect you from the sun, but a little modesty goes a long way to preventing "hassling"- we were told that the local men found shorts/ bikinis when we were out in the street an invitation to grope!
it is normal for people to "invite" you into their shops, if you don't want to go in, smile, and say "no thankyou" firmly and move on. Persuasion seems to be a way of life over there, and it's easy to get drawn into buying something you don't really want.
haggling is a way of life, but don't go too far. Yes, they will charge tourists a lot more than locals, but we are immeasurably rich compared to most of them. You will get a bargain (in UK terms) if you haggle, but probably will not get something "dirt cheap".
tipping (baksheesh) is also a way of life.
I hope this is the sort of info your friend wants!
May post more if I can remember any_ I seem to remember an excellent local fish restaurant, but can't remeber if that was in Hurghada or Sharm el Sheikh, maybe kiwicath can help?