Breakfast in Thailand is rich, including curry rice, Thai rice noodles, fried eggs, seafood soup, vegetable salad, fresh fruit juice/fruit tea, and western sandwiches. Because there are many kinds, you can basically eat your favorite taste.
You can also buy fresh squeezed fruit juice on the roadside. The soybean milk in the 7-11 supermarket is very delicious. If you can meet it, you might as well buy it.