Depends on your style and what type of food you eat . I am sure as your Dad leaves in pattaya he knows the best places to eat. There are english style restaurants , for example The Pig and whistle where you can get a good meal from 300 - 600 baht but there are also Thai places where you can eat as much as you want for 150 Baht.
If you eat where thai's eat you can get a meal from 40 -60 baht. Drinks in Bars cost from 55 - 70 baht average but show bars or clubs average 120 - 150 baht. Depends on where your Dad lives but baht Buses are only 10 baht a journey - must bars close at 2am but you will find bars still open at 4 am.
Try not to stay in Pattaya all the time - persuade your Dad to go to Koh Samet for a couple of day's and or spend a couple of days in Bangkok before you leave . A sensible budget would be 3000 baht a day but you can easily get by on 2000 baht a day. You will have a wonderful time and you will return - everybody does.
Not much if you are careful and eat street foods which are good - and stay away from tourist traps like Walking Streets... I bet you can survive on a couple of pounds a day - then after that, whatever you want.
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