Welcome to Thailand I love to see your reaction. Try the local street food and fruit it is very good and cheap. I recommend you carry a small change like 20, 50, 100 bath bill so, you don’t have any problems with taxi driver or Tuck Tuck. If they said they don't have a change for a big bill. You can change from 1000 bill to a small bill by go to 7eleven anywhere in Thailand on problem.