Hi there. I wanna welcome you to Asia! :)
In Bangkok, if you like shopping for anything I would recommend Chatuchak Market.
While in Cambodia, which is my favorite travel place particulary Siem Reap because I love the provincial vibe of the place. I love nature so this is the perfect place I would recommend. They have there, the famous Angkor Wat. If you want to have fun at night you can check Pub Street
Enjoy your travel. Take care. Cheers! :)