How much Thai Baht is suitable for a 5-day trip to Phuket? How much is the typical tip?

If you don’t count air tickets and accommodation, it’s about 10,000 yuan for five days. However, I suggest you first exchange 6,000 yuan of Thai baht at the domestic Bank of China, and then bring some UnionPay cards with you. Phuket Island can be visited all over the world. It's an ATM with a Chinese interface. You can use as many as you want. Don't exchange money at the airport, it's too dark.