Hihi!
You can google the flag and download and print a bunch of them on paper and post them around the party space.
Can you get ground beef where you are? If so, then you are in business of cookin' U.S.A.! Hamburgers cooked on a charcoal grill with slices of tomato, lettuce, ketchup and mustard, sliced pickles and onion on some sort of bread or bun and you are set! Brew some black tea, sweeten it lightly with sugar, and pour it over ice with wedges of lemon in a tall glass.
If you can get potatoes and mayonnaise, you can make potato salad - tons of recipes on the web.
And if you want dessert, an apple pie would be right at home for any 4th celebration.
Of course, if you were willing to fly myself and my wife to Bangkok, I will cook it all up for you nice!
