Agoda tips
Actually the best way to use Agoda is use mobile app - which usually is 10% cheaper than website. Then pay in THB and always use promo code, such as BONVOYAGE to get additional discount.
Other tips:
1. Grab bike if you travel alone - fastest and cheaper
2. Buy Rabbit card and metro car to save queue time
3. Use Klook to buy Sim card, tourist package