Keep an eye out at Thai-Lao Open-Border Market — you're bound to uncover some unique curio in one of its many stalls. After you've had a thorough browse of things, try some fare from one of the local food vendors.
Tick this community marketplace in That Phanom off your to-see list and then make a beeline for Wat Phra That Phanom. Located near Thai-Lao Open-Border Market, it's also a hit with travelers.