[ukguy84]

This advice is for your friend, but its also the same for everyone.
If he is bigger than average, he will lose more liquid in the heat, make sure he has a bottle of water with him every time he goes out, it is also a good excuse to drink more beer!
Tell him not to pull back when the girls in the bars of Patong come over to him and rub his belly, it is good luck for them, it is like touching the Buddha's belly.
Keep a smile on your face, it goes a long way.

Above all else, have a great time!!