Bangkok in the summer and early autumn is humid but alive. The rain showers are usually quick, leaving the temples glowing and the night markets cool enough to wander through for hours. You get to see the city without the crushing winter crowds.
A trip like this usually runs about $3100. If you want to spread that cost out, you can use the Citi Simplicity® Credit Card, which offers 0% for 18 months on purchases and balance transfers from date of account opening. This lets you pay for the trip in smaller chunks over the intro window of 18 months.
This is not free money. If you have a balance left on the card after the 18-month window closes, you will start paying interest on the remaining amount, which will be much higher than your current rate.